Malicious PDF — malware analysis report

Static analysis result for SHA-256 7312e5ae9376d263…

MALICIOUS

PDF

49.0 KB Created: 2020-08-20 09:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70911350eb838703c01ecb12b1e4f41e SHA-1: 296fc18a13e8c327cf6bf4269296e33e04a31ff3 SHA-256: 7312e5ae9376d263366f1b36ed278813f4e8de7584ee4008a7f0043869aeb7c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.cc', which is likely used to obscure the final malicious destination. 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.cc/pify?keyword=android+auto+honda+accord
    • http://paxafese.peopleripple.com/uploads/1/3/1/8/131857315/betoko.pdf
    • http://nulobapu.theroadrises.com/uploads/1/3/1/4/131483036/sapinubaper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/jofadasovisabex.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/business_intelligence_for_dummies_swain_scheps_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/pepim.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/craftsman_chainsaw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3821/files/wheel_of_monotony.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/diwen.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/galivaxajufugunudimur.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2317/files/68604849220.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/33833647274.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/wugokidewajizixu.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_off00007c88.bin
9383de52a40f158d7383ef0e27a3dcb7a1c457989114f8f52da7177360662531
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C88 4804 bytes
font_01_sfnt_off00008ccd.bin
7e60d0eb2d0f4047388e58067456ca21b3938dcbaa255a5e30b4cffddb00bf0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCD 13432 bytes