Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b2c510e83a6d84…

MALICIOUS

PDF

43.9 KB Created: 2020-08-08 08:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96bbe48f74eebbb987edc7358dbb2988 SHA-1: ef05514f8cac2a02adf512f6a99337e64043fd12 SHA-256: 66b2c510e83a6d842045ab8cf9db5e4743286a0d12575fa8f01bbf45beb63421
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'business letter format book pdf' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt.

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/pify?keyword=business+letter+format+book+pdf
    • http://files.craiglistschryslerkcar.org/uploads/1/3/0/7/130776111/tuvasaso_janakawabobed_wavepajerenala.pdf
    • http://files.southbyland.com/uploads/1/3/0/8/130814397/8766039.pdf
    • http://files.allaroundanimalcontrol.com/uploads/1/3/1/6/131636678/labofifidi-fisufuwokadoxak-loxefekekezil.pdf
    • http://files.katpostmod.com/uploads/1/3/2/6/132681670/lisenoronisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/7660787219.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/66741825591.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/canada_provinces_and_territories_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/jekar.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/attack_on_titan_crimson_bow_and_arrow.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/foxawedatajuposusozotew.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/ruwimade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/gizegibogubosenixonowaka.pdf
    • https://cdn.shopify.com/s/files/1/0435/6174/6595/files/zopesibusabusavekexaxef.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/59508173266.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/zanirikaxizuf.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_off00006db1.bin
5ccbefb93f2395b5535b18b08671e5c702c43e0ef56c42ab12688890accd330c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB1 5440 bytes
font_01_sfnt_off00008011.bin
ec4f7eb621f20456ce31d149fc899f4c198a875685234999e5bbc231d1474bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8011 10120 bytes

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