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)
MD5: 15925151c01595e74a5821dc54dff880 SHA-1: 234e1711cda75b2749beef5050a97822052eea2c SHA-256: aecf661d2dde5fca8d992fcece9d523314d7cf0b21bd91f39abe1f0a11f2cfa0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.cc/pify?keyword=bengali+calendar+2020+20+pdf+download'. The document body, though partially corrupted, also contains this URL and references a 'Bengali calendar 2020 20 pdf download', suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.durjavaoriginals.com/uploads/1/3/1/3/131381946/pojekukatez_bajojuf.pdf
    • http://files.partydecorationsbyteresa.com/uploads/1/3/1/4/131437306/6856204.pdf
    • http://files.flyinktattooparlor.com/uploads/1/3/1/3/131379999/jilokonedun_gunim_gusuvevavuk.pdf
    • http://files.sharonlasalle.com/uploads/1/3/0/7/130775646/gewitalabib-zebamefowekexi-gaveteluraneg.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0954/files/32264164709.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34597476450.pdf
    • https://cdn.shopify.com/s/files/1/0433/4518/2888/files/55913681494.pdf
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/95432503159.pdf
    • https://cdn.shopify.com/s/files/1/0434/7261/7637/files/50455017825.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/3360166555.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/biology_book_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/7667637655.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57379697448.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/32127989638.pdf
    • https://cdn.shopify.com/s/files/1/0433/2381/8139/files/ponuzabizulazofolopejaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/98201830360.pdf
    • https://cdn.shopify.com/s/files/1/0454/5793/2446/files/critical_theory_in_english_literature.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/25735025823.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 6

Files carved from inside the sample during analysis.

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

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