Malicious PDF — malware analysis report

Static analysis result for SHA-256 87471bd417f95125…

MALICIOUS

PDF

42.3 KB Created: 2020-10-30 20:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: acd302961f0f435ad9e2a9e4f8b052c1 SHA-1: 8376d6759ac57255c7542832d7e3a5c678eab3ee SHA-256: 87471bd417f951253878ec27de180bdedfc34d1b790ef4cb05d5088c853f0742
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of embedded links pointing to redirector infrastructure, specifically identified as a link farm. The primary lure appears to be related to a "gold humanism honor society utmb" keyword, suggesting a phishing or scam attempt. The document's structure and numerous external links indicate an effort to drive traffic to potentially harmful sites.

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.ru/123?keyword=gold+humanism+honor+society+utmb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f86fb122ded8.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bekalan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414167/normal_5f9c2e8b53421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f8b4d9cae474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f937367f0fe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f8f4c9c806d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f89f142080c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8f2c66b5542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5f8a7703d1086.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/1/0501/5771/5621/files/vatufalurepofewituxuwi.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 8

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_off000063e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5452 bytes
SHA-256: 9c3241f57c28c9904ce119e6dc291de685ea7296e0fd094ffcaf664f9c94392e
font_01_sfnt_off00007641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7641 11852 bytes
SHA-256: df7df85f4b83fff7c3f322edcbf5448977ab6c3c32226c702604732542501a85

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