Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea05fe8f313085e1…

MALICIOUS

PDF

35.8 KB Created: 2020-08-01 12:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22695ddb395976647aa24bb50fc26c62 SHA-1: 212330fb8e0a4f90c7ae00ba56c5e773c7b614bd SHA-256: ea05fe8f313085e109757bc9db64415f0d348d5230f0a111bb32680ed18d3812
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=vtech+cs6124+manual', suggesting a lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution campaign.

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=vtech+cs6124+manual
    • http://files.trffoodshelf.org/uploads/1/3/1/6/131636602/pufikapoxutoga.pdf
    • http://files.cranstoneastsoccer.com/uploads/1/3/0/7/130739974/442a05ed.pdf
    • http://files.kimsminis.com/uploads/1/3/0/7/130775405/dazoxevajonapon-koregel-boxuj.pdf
    • http://files.crysis-cake-scene.com/uploads/1/3/2/6/132681901/noraposorolor.pdf
    • http://files.betsyleebaileymusic.com/uploads/1/3/1/4/131453215/fumuripaw_xofidirawekimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/9223241328.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/rezaredefelejup.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/39894573412.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/xorovoxamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/witiwunibejazagerowulot.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/nekanapebepujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/90649247120.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/talugatalukalafuseso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/begigoxuripagizaxubizuro.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ebd.bin
4f54eea32b61aa23eb519994166a74a0e269b55b55fb3fc7691b11a74d1eef1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBD 5336 bytes
font_01_sfnt_off000060d0.bin
c5cd28a7be9891a20c361ff4bddbaa143b760d35798843b8b2317b915ab69c80
pdf-font-stream PDF embedded font (sfnt) at offset 0x60D0 10092 bytes