Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e74e785bda8b4d…

MALICIOUS

PDF

45.7 KB Created: 2020-11-08 03:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a528d8b4ceafaee5ab1a7ab57caebce9 SHA-1: 7ac49c3089a59e22d9136876f06365f387da37ab SHA-256: b0e74e785bda8b4d7732811e29473daa2fa199ab3c592a909460974b8db731fd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO spam or link farm operation. The primary malicious URL identified is https://traffset.ru/aws?keyword=4l80e+manual+wiring, which is likely used to redirect users to further malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?keyword=4l80e+manual+wiring
    • https://cdn-cms.f-static.net/uploads/4417664/normal_5f9ac61290dd3.pdf
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/tomuparaxidavufizida.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/34c2ec4c552d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vaxebisapesi/sample_invitation_letter_for_visa_to_canada.pdf
    • https://s3.amazonaws.com/bepukuba/the_stranger_albert_camus_book.pdf
    • https://uploads.strikinglycdn.com/files/011c9a73-cd52-4b76-8521-2b494c6cb6a5/download_pokemon_fire_red_rom.pdf
    • https://uploads.strikinglycdn.com/files/6b021603-0c41-4c56-9805-8b7b20f76990/gregg_style_manual.pdf
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdf
    • https://uploads.strikinglycdn.com/files/8bc474ea-fcf4-478c-84b2-bce105f6abdc/62743185.pdf
    • https://s3.amazonaws.com/loxopudizus/xixupajusebikuzejo.pdf
    • https://uploads.strikinglycdn.com/files/34e62826-eb2b-411a-80e3-8d4f1d066aed/jiweminunugutos.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_off00006d51.bin
f02d0d64e8765d9663483bf330949cf49225d83e99972cae96df4453fb50d49e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D51 5248 bytes
font_01_sfnt_off00007f27.bin
de1da4dfb6577fa8e0c469b53eba1ea031b8f3c133f1e100aba905fddb97fb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F27 12412 bytes

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