Malicious PDF — malware analysis report

Static analysis result for SHA-256 632ca1dd76d2e658…

MALICIOUS

PDF

51.1 KB Created: 2020-07-29 11:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1eb3fb025982a6b877216f1e332cfa0 SHA-1: 91099c80cc30a901a611044132547f3a91eec24f SHA-256: 632ca1dd76d2e658cc7603d91a92cb0fdc86f9cd2be5cf16e3518be434de631b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=carburettor+function+pdf
    • http://files.healingartsofthesouth.com/uploads/1/3/1/4/131483002/4836768.pdf
    • http://files.hebsolutions.org/uploads/1/3/2/6/132681476/mowojexarupa.pdf
    • http://files.mybrightdelights.com/uploads/1/3/1/4/131483317/5c5e3e7b38eeea5.pdf
    • http://files.strausorganizingsolutions.com/uploads/1/3/2/7/132740464/kapin-zamasobexijozaw-mamoruf.pdf
    • http://files.greymatternoise.com/uploads/1/3/1/1/131163666/2416950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/nonavedepewesot.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/67713814735.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/81568768624.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/vemiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/90413533760.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/nevaxufupikugevomipipivuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7888/5280/files/12380156483.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/xelirimisen.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/59517350711.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/fadewagufog.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_off00008b67.bin
b017d86dfba9e0adbebad20a46b906d02d7d866b08b11061f825eaa6be5a064c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B67 4984 bytes
font_01_sfnt_off00009c63.bin
da2e436dd68a2f6d6a63da52cb5103b271321e681b4af765e5a6d679eaac77c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C63 10088 bytes