Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe1d6f070d70cce…

MALICIOUS

PDF

43.6 KB Created: 2020-07-10 19:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 200b0aa6dd1e927568f86ad95477ab0f SHA-1: cdcd14ac12ea88fd81d742400586d75e6151979d SHA-256: bbe1d6f070d70cce9735a7aeef16e0c252e0ffe0c73acffd1fbf57114b5ff3ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external websites, indicating a link farm or redirection scheme. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to a 'microbial biotechnology textbook pdf'.

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=microbial%20biotechnology%20textbook%20pdf
    • http://files.bryantowich.com/uploads/1/3/1/8/131857112/6f6b902a3175a.pdf
    • http://files.bbsimon.com/uploads/1/3/2/6/132682570/tudijimavu.pdf
    • http://files.bambooartscenter.com/uploads/1/3/1/8/131857071/pujeriwetid-napofemerumaw.pdf
    • http://files.michaelpachelo.com/uploads/1/3/0/8/130814340/jibekinejezireluga.pdf
    • http://files.connoisseurstours.com/uploads/1/3/1/8/131857071/abaa266e7dc9a.pdf
    • http://files.communitychurchofkeystoneheights.org/uploads/1/3/0/7/130775859/7249462.pdf
    • http://files.happiervalley.com/uploads/1/3/2/6/132681212/voboduwamesopagesi.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • https://tuwomime.files.wordpress.com/2020/07/sureta.pdf
    • https://mevowavam.files.wordpress.com/2020/07/32598605940.pdf
    • https://fiwojinugir.files.wordpress.com/2020/06/berulitosesamezopasafelo.pdf
    • https://vokizowonaso.files.wordpress.com/2020/06/vemowajutuzuboboxalenilo.pdf
    • https://wekusov.files.wordpress.com/2020/06/44719013854.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/68529755748.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/6036130603.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/fuzijewupamefapapi.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/
    • https://fiwojinugir.files.wordpress.com/2020/06/ber

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d6f.bin
9237b512ed107ae5bc324dd71de533a5f724dc3606a75ff0c1cc22d427468727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 5404 bytes
font_01_sfnt_off00007fc7.bin
a37764dce8057144d87e3e5677bf4c74b61070639dd5757a9d8f57a0a5827a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC7 9680 bytes

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