Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aca74e67f6b9f69…

MALICIOUS

PDF

40.1 KB Created: 2020-08-05 22:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60ea8f3346d52f6885aa345dbe11cc20 SHA-1: d9084c5749de9f583f623404f6197270ff434b38 SHA-256: 0aca74e67f6b9f69c855d549d23f31c651d27922503e3ef86d898d9208b6ac16
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed to mimic search results for PDFs. One prominent link redirects to a known malicious domain, ttraff.ru, suggesting a phishing or malware distribution attempt. 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/pify?keyword=doing+bayesian+data+analysis+second+edition+pdf
    • http://xujak.triggerindustriesinc.com/uploads/1/3/1/4/131408024/a0bdc5e270cfeb0.pdf
    • http://files.omnibusologist.com/uploads/1/3/2/6/132695543/jogamoboxejuresugi.pdf
    • http://files.whitegallowaysofwayby.com/uploads/1/3/0/8/130873907/fewubogukobavel-sixomolimu-mifip.pdf
    • http://files.dynamitekickboxing.com/uploads/1/3/1/4/131438299/52f75b6a2a1b.pdf
    • http://files.thenakedfish.com/uploads/1/3/2/6/132696604/gutebo_waxab_vuviraxegexoru_vumobo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7673/1558/files/fuwifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/54011939626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/60951459715.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/lunozamopuwoxuvov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/20652089562.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/fukipasititesed.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6670/files/pabak.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/62790028015.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/javascript_revealing_module_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/zusipuxes.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8917/files/microsoft_digital_imaging.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_off00005dd8.bin
847ed262a55dc6c4175e585265423296e985dc3fd7a091ddc2a030efdf12c602
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 5468 bytes
font_01_sfnt_off00007092.bin
5b4cfc67cba24f605f15d5d4c2665872447e1d9af8ce119fb5324d6f446e1c87
pdf-font-stream PDF embedded font (sfnt) at offset 0x7092 10108 bytes