Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecf661d2dde5fca…

MALICIOUS

PDF

64.9 KB Created: 2020-08-09 17:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 15925151c01595e74a5821dc54dff880 SHA-1: 234e1711cda75b2749beef5050a97822052eea2c SHA-256: aecf661d2dde5fca8d992fcece9d523314d7cf0b21bd91f39abe1f0a11f2cfa0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) that is flagged as malicious. The document body and heuristics indicate an attempt to lure users with a fake download link for a Bengali calendar, which is a common phishing pretext. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=bengali+calendar+2020+20+pdf+download In PDF document text
    • http://files.durjavaoriginals.com/uploads/1/3/1/3/131381946/pojekukatez_bajojuf.pdfIn PDF document text
    • http://files.partydecorationsbyteresa.com/uploads/1/3/1/4/131437306/6856204.pdfIn PDF document text
    • http://files.flyinktattooparlor.com/uploads/1/3/1/3/131379999/jilokonedun_gunim_gusuvevavuk.pdfIn PDF document text
    • http://files.sharonlasalle.com/uploads/1/3/0/7/130775646/gewitalabib-zebamefowekexi-gaveteluraneg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3966/0954/files/32264164709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34597476450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4518/2888/files/55913681494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/95432503159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/50455017825.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/3360166555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/biology_book_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/7667637655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57379697448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/32127989638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2381/8139/files/ponuzabizulazofolopejaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/98201830360.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/5793/2446/files/critical_theory_in_english_literature.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/25735025823.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6610 5560 bytes
SHA-256: 0b97bbf186a73585c70a2a62bfad9122cea2541884b9ba190d2d5bbe8c01c1db
font_01_sfnt_off00007922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7922 10676 bytes
SHA-256: 246f6228bcdb0f3e41acff216845e64ce50663c046a76f5e1c14561cd0a3faf0
font_02_sfnt_off00009c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C13 1912 bytes
SHA-256: 10b43ecc1c080f527ac22fdad5379ea777f1378f0a8be64d5544c0624bd7b04b
font_03_sfnt_off0000a554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA554 12488 bytes
SHA-256: fb03de4a3151b2926469f3dc9f3970ee29448ff1b21d6588ef6f2198fdf79d5c
font_04_sfnt_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 16256 bytes
SHA-256: 960f27b9686f9852210371a962f0bc0a21a6646b3bd8288d85f783eeadcc57fc
font_05_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 4180 bytes
SHA-256: 9c633c44f5360c1491a4e05907dfebee8f9a50900b47b2ce9195f96a885a445d

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