Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bb5b299cb19813…

MALICIOUS

PDF

55.6 KB Created: 2020-08-07 22:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f05327a3fd6c1b3d1a1ccd4a04d560db SHA-1: a96b67145d19d9edf68e9800107a9b283afbd018 SHA-256: 86bb5b299cb1981391dff36bd9a16c13e92d5f3d0f6c84fe06ed8d219cd0c2dc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'plastic plating process'. The presence of numerous other links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=plastic%20plating%20process%20pdf
    • http://files.anzterriers.com/uploads/1/3/2/6/132681209/9886041.pdf
    • http://files.permitsfl.com/uploads/1/3/1/4/131454560/d650b129e25.pdf
    • http://files.mounttaborbaseball.com/uploads/1/3/0/8/130813982/9700333.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/91436341045.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdf
    • https://cdn.shopify.com/s/files/1/0439/0263/2104/files/que_es_la_angiogenesis_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/53298667186.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/4053599924.pdf
    • https://cdn.shopify.com/s/files/1/0447/7832/4117/files/is_gangstar_vegas_offline.pdf
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/resume_for_grad_school.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/9983825509.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/tikijisekakibuxawuvol.pdf
    • https://cdn.shopify.com/s/files/1/0432/5736/4638/files/mugajari.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/99654261926.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_off00009b6c.bin
970d5532db6345dbf75f62a1fbdc848fcdb03be51f39d339d0eda712f2dbf9d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6C 5324 bytes
font_01_sfnt_off0000ad95.bin
80289af69dbcf98c075b06627576a2874fa72b671e5b6c2b42291669bdb5aedf
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD95 10620 bytes