Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3530b3a80c2410e…

MALICIOUS

PDF

46.7 KB Created: 2020-11-08 01:35:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98f6d61b3b637f3c41dac36082f1cd48 SHA-1: 9ece2c048cccb14d48bdbe4f74f16899a9e8d04e SHA-256: b3530b3a80c2410ea8160c0abc12ce88796c9681c75febc085ef75b4c2d4ca73
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external websites. One prominent URL, 'https://trafficel.ru/aws?keyword=roku+58+inch+tv+walmart', appears to be part of an SEO spam campaign. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure suggests an attempt to redirect users to potentially harmful content.

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://trafficel.ru/aws?keyword=roku+58+inch+tv+walmart
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f960f37696d9.pdf
    • https://demifoji.weebly.com/uploads/1/3/4/3/134317184/gefonobuxod_bifukomaleg.pdf
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/3879004.pdf
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5f9f8af253c8d.pdf
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/fitakuxufepegija.pdf
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f8bbffea13e6.pdf
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5fa3693b6b3b0.pdf
    • https://titobuvidotid.weebly.com/uploads/1/3/4/5/134598786/12cb5b6f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f13bd4ed-a8f7-473c-baef-69dada9d515b/jozebagubigelet.pdf
    • https://balapep.files.wordpress.com/2020/11/serpientes_y_escaleras_dibujos.pdf
    • https://zedapakaxivi.files.wordpress.com/2020/11/que_es_contabilidad_autores.pdf
    • https://fevenakom.files.wordpress.com/2020/11/31243793227.pdf
    • https://uploads.strikinglycdn.com/files/d6ef9fe0-0ee3-4c62-81b2-acba0481f10c/rilerufukumu.pdf
    • https://nelavikix.files.wordpress.com/2020/11/93937576280.pdf
    • https://gibugorisutu.files.wordpress.com/2020/11/kulaxe.pdf
    • https://uploads.strikinglycdn.com/files/1f596457-05e8-48c0-9734-236950b15f92/raxoluniluponekukipe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b67.bin
ffdcfbe6a224951841786a72ef03406150ef3dcbd9995cf85bf34b8cb3f19fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B67 5164 bytes
font_01_sfnt_off00007cd6.bin
f87eda18bf1f157add33a1805de046b538874beea07bc5fd7e1ad1cb798ad4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD6 10356 bytes
font_02_sfnt_off0000a01c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xA01C 4324 bytes