Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8fe5b0c9313bab…

MALICIOUS

PDF

42.2 KB Created: 2020-08-19 06:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1be9d9fc904a423baf3a95eb01cf6c9c SHA-1: 0b8cd4bccb79616f953b9802bccd877c90b20219 SHA-256: 8e8fe5b0c9313babdcd9c4b0fb1b9b8b1fec6d5723fa70ed94c655aac52286ac
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=aggregate+planning+nptel+pdf', is known to redirect to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The document body itself is heavily obfuscated and contains what appears to be a reconstructed URL, but the primary malicious activity is the distribution of links.

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=aggregate+planning+nptel+pdf In PDF document text
    • http://files.hiddenvalleymammoth.com/uploads/1/3/0/7/130776626/774d2479b.pdfIn PDF document text
    • http://files.mrwhitcher.com/uploads/1/3/1/3/131380889/nulivulamibixi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/91111071716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/chads2_vasc_score.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/ludobinirodelij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/80851733373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4436/4710/files/pujunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/248138192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/lavirafevulusuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/ethernet_controller_driver_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/dearly_beloved_piano_sheet_music_easy.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

Related samples 5

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 5020 bytes
SHA-256: 8ff33b4a8e0e58975e24543c18dcc6547bb5933857a5955bece3c01c1fe8dbf3
font_01_sfnt_off00007a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 10204 bytes
SHA-256: 76afe013f79fdfa6eb5f3988939adb468117106f9d46c76e4a96f9b4b5aa00da

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