Malicious PDF — malware analysis report

Static analysis result for SHA-256 8872260bf846e518…

MALICIOUS

PDF

42.2 KB Created: 2020-08-09 15:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ae73e1fd171c7fc0d2d611e56becb7a SHA-1: 0d2c18525404da859b988f0c91de2889060a9cc2 SHA-256: 8872260bf846e518e08df9ba859811ae571f5a2bc74bc4040295937a72e87db5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though partially corrupted, contains text related to calendars and printing, aligning with the lure of downloading a useful file.

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.cc/pify?keyword=calendrier+2020+%25C3%25A0+imprimer+pdf+et+excel
    • http://basuvixem.longevitymonth.org/uploads/1/3/2/6/132682076/2487191.pdf
    • http://files.marsjoyofpainting.com/uploads/1/3/1/6/131606127/1986964.pdf
    • http://files.mlkviolinist.com/uploads/1/3/1/6/131606227/f47ee4e1e0fe9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4647/6708/files/97532485012.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/full_detail_of_gst.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0160/files/92003507265.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/42665722273.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/54064488579.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/2018_dodge_durango_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/waledumetujafixuvok.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/nokusenodawibezegoteb.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/gegugafusekumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/types_of_bioassays.pdf
    • https://cdn.shopify.com/s/files/1/0438/5662/5829/files/mandalas_para_colorear_por_numeros.pdf
    • https://cdn.shopify.com/s/files/1/0432/5189/2381/files/siwunorerejogoxolonekig.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_off0000627d.bin
5a62df327c3fec0812d3bafecf0492195dfae2b3ab08b7fa437704ede9e66f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627D 5604 bytes
font_01_sfnt_off000074e9.bin
6163ab54e416292a316233ce56d5c48919ec3b73f125f5a232d6d21e8268c4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 11676 bytes

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