Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ac5e7146929c0…

MALICIOUS

PDF

47.1 KB Created: 2020-08-11 19:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: debe5af7a8a55d5ebdfd85e0cb1ced1e SHA-1: a3a125038e22f490643f6c45ba97e949ce30a12d SHA-256: 833ac5e7146929c066d8305c6097c77414bbf16cde1418d180d39fd20134d1db
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to generate SEO traffic, with one specific link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting a phishing or redirection attempt. No scripts were extracted, but the presence of malicious links and the heuristic firings strongly indicate a malicious intent to redirect users to harmful content.

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=wedding+march+partitura+piano+pdf
    • http://xitezoz.tonyariel.com/uploads/1/3/0/9/130969077/cd1440e.pdf
    • http://files.emberlight.co.nz/uploads/1/3/1/0/131071056/d49f131.pdf
    • http://files.rickysaputrayoga.com/uploads/1/3/1/4/131437074/wojexadelubaz_sijemuvoma.pdf
    • http://wazol.michiganpooltournament.com/uploads/1/3/0/7/130775085/tenabupizid-ribowumudapili-pufudiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/cambridge_primary_mathematics_stage_1_teacher_s_resource.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/astronomy_physics_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/30279402664.pdf
    • https://cdn.shopify.com/s/files/1/0438/2513/5776/files/86539767367.pdf
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/jigotumezuzuli.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3445/files/19460856081.pdf
    • https://cdn.shopify.com/s/files/1/0431/3356/7125/files/liwowewamofotupadari.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/ridakebexutowikatoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/catalog_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/sorisufivuwubomogagiruxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/wuwuvugopin.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_off0000796a.bin
e80c4c240f4e789357a1facbab13c74a6290c890f54dfb1950a9e314c178fd94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796A 5372 bytes
font_01_sfnt_off00008b86.bin
3f5b286735c570a9a8acee319ab00b41cc39b124bafe137c36d1615f2cb32195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B86 10452 bytes

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