Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef9222d47849d25…

MALICIOUS

PDF

60.6 KB Created: 2020-11-06 22:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c26e74ea09e3eaae0f5ddea8d5867d95 SHA-1: b4d833221a910d68691cc3dff143cc8e06b9d58c SHA-256: 7ef9222d47849d25ce671d35cd2921e9c1cca8817d6b52683a2b8a67a813ecc2
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://trafffi.ru/123?keyword=bl2+head+and+skins+gibbed+codes+2013, is embedded in the document body and likely serves as the initial lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://trafffi.ru/123?keyword=bl2+head+and+skins+gibbed+codes+2013
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/pilukane_vegezefuromi_pawonurat_puxopudofifa.pdf
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/zovoxa.pdf
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/verogufugiko_rujexelekox_tewapesezolegi_dilubolo.pdf
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/7e10b87.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/8241557.pdf
    • https://gizarokidobibaw.weebly.com/uploads/1/3/4/3/134363860/zerigug_gexirokejepu.pdf
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/koxatan.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/tizomagegetisovas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdf
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdf
    • https://s3.amazonaws.com/susonanezaj/ode_to_autumn_poem_explanation.pdf
    • https://fodabijiwifi.files.wordpress.com/2020/11/33887201684.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_off0000aa7b.bin
8f65d4be4215b932a42f9f3e7ce1313a5a1b9f3eeebe5d2a30314a0b168c498e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7B 5848 bytes
font_01_sfnt_off0000be66.bin
293bf7551fb48a9dd34ee51a79ef753ce51dfe6ca824e9d93c79425685b0968b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE66 11904 bytes

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