Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b18ad99c62bd6b0…

MALICIOUS

PDF

51.1 KB Created: 2020-07-20 22:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48af679e73bc76d09d9891522d7803c3 SHA-1: 87ea0eeb3637085d9b5054df5e92508f3bb75494 SHA-256: 6b18ad99c62bd6b085e27dee384048e99518d349237f2aad71bc300dcb3c1c69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'major functions of lipids pdf'. The heuristic firings strongly indicate this PDF is designed to redirect users to malicious infrastructure, likely as part of a link farm or SEO manipulation scheme.

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.ru/wb?keyword=major%20functions%20of%20lipids%20pdf
    • http://files.windsoressexcpr.com/uploads/1/3/0/9/130969740/komenijejitutivep.pdf
    • http://files.connoisseurstours.com/uploads/1/3/1/8/131857071/abaa266e7dc9a.pdf
    • http://files.savefarthingworthgreen.org/uploads/1/3/0/8/130873840/9027896.pdf
    • http://files.stonycreekcanineacademy.com/uploads/1/3/1/4/131453753/bc4689.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/goxotivozoxoregavijeva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/11838969773.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/10704768176.pdf
    • https://xesovegera.files.wordpress.com/2020/06/likapipifagazesaleleto.pdf
    • https://dakumujewul503206248.files.wordpress.com/2020/06/15482939104.pdf
    • https://perorukone.files.wordpress.com/2020/07/xibojatirowimuvu.pdf
    • https://materasaz.files.wordpress.com/2020/07/reluxodub.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/vasitebetufo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/75449960936.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ginowojero.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/pujuxulorubis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/33432404370.pdf
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/21563494554.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/88957093864.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonamov.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b6f.bin
67d6172d930ea832564a9926f56eee1e07cd0cf17850cc6304b996ee91469957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6F 4992 bytes
font_01_sfnt_off00009c75.bin
d8ff731f9ab9ce6432160118385ae2a1a69b27e879b4a78192958076095795d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C75 10256 bytes

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