Malicious PDF — malware analysis report

Static analysis result for SHA-256 8410a72a10457294…

MALICIOUS

PDF

40.4 KB Created: 2020-08-16 17:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 932ee4a30f783b972b78d12eeba3cb07 SHA-1: 0ab808f1a20b5ed1238d3498017475d920db1ff9 SHA-256: 8410a72a10457294c60235e13824198015ddfdc073e30f3bd527fb3a08a3758d
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/pify?keyword=alelos+multiples+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains the malicious URL and several other PDF links, suggesting an attempt to direct users to potentially harmful content.

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=alelos+multiples+pdf
    • http://files.staloysiuschurch.com/uploads/1/3/1/6/131637362/601794.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/govatij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/english_to_russian_dictionary_with_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/gexuvekedagajovigo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3233/6792/files/que_es_la_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/86458049977.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/zogofaguvegujovowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texigusowemojegovivek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9321/3855/files/xupatejesupugefunazazeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3571/files/12155468678.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_off000061d3.bin
de600a706210fad34bb22d6a5984f952d813d9f6d6fbfdfd0f0389d36bf3d486
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D3 4872 bytes
font_01_sfnt_off00007255.bin
8774dc4cf7918e4f3dca353ed86eb12b064eb21f894f58e718068282fb431fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7255 10204 bytes