Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a375e03d4e7c06e…

MALICIOUS

PDF

39.9 KB Created: 2020-08-27 16:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0b964851ad681ef1ab52ad1d64ae2cc SHA-1: a99fd58da21cd8bf2c6ff725c1f9259c31d5f1f0 SHA-256: 5a375e03d4e7c06e75aad3d9ae3bc0cf3d367aa8acd9d152e6d27548aa6a2b3b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Intel hd 515 driver' and a URL that appears to be a lure. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=intel+hd+515+driver
    • http://files.rainaiscrazy.com/uploads/1/3/0/7/130739525/eee624f8ed339.pdf
    • http://zunegeni.cgvideoproductions.com/uploads/1/3/0/9/130969352/36224.pdf
    • http://zeropi.bellevueshockers.com/uploads/1/3/1/0/131070571/3387046.pdf
    • http://files.linwoodrumney.com/uploads/1/3/0/9/130969322/2c8ace76353e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7474/7545/files/balancing_equations_grade_10_worksheet_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/puwalazivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/76081706522.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/fapugawuxev.pdf
    • https://cdn.shopify.com/s/files/1/0434/6668/6617/files/mubaminigubulamo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4031/files/just_cause_1_achievement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/reganazi.pdf
    • https://cdn.shopify.com/s/files/1/0447/9234/8838/files/26690098641.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7789/files/82622106157.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_off00005651.bin
86e60e9c2ce2fd224ac046655cfd3a1b41b617e04d8aa9d5566a137b9c0aab4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5651 4696 bytes
font_01_sfnt_off0000664c.bin
69225171f3a8505d397e207e72f3ced98e3ba3d4362e1902353dad19f8819d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x664C 14088 bytes