Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a91a1ca56d8b304…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 09:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a23f49017a4b3036eab216d6b179ea40 SHA-1: 95dfbba55bec05f17cab0500a86193bddc7d1f34 SHA-256: 5a91a1ca56d8b304acfe01a582ca54253454b0c7da9803fbafb57f1e4f4c19d2
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=final%20cut%20pro%20keyboard%20shortcuts%20pdf
    • http://files.kxcentre.com/uploads/1/3/0/7/130740530/2662a21e.pdf
    • http://files.adamswellscrisiscenter.com/uploads/1/3/1/8/131871852/3e0e7.pdf
    • http://files.humblewarrioryoga.org/uploads/1/3/1/4/131452944/0b95bb4a1f.pdf
    • http://wawimasa.thegrillhousecompany.com/uploads/1/3/2/6/132682787/piwubuz_zirudiremumeb_melunezom_bizaxekum.pdf
    • http://files.farwestspearmint.org/uploads/1/3/1/4/131407357/5071084.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/51558731279.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/boxaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/59326875839.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/veronica_mars_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/4937/0268/files/rigugapotezosarixutaparu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/73851295594.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/java_language_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/stewart_calculus_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/kupelexubefivivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/bazemodapiseviluvufasomu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee0.bin
e2560e1aa464d6b4dae9d8bed5efffff7196634552af1cc30c9e3380f51d8109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE0 5384 bytes
font_01_sfnt_off00007122.bin
9c8bc654c812f2e03c626198fe8367879e20c4cc930c41115c381e8fd0f12df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 10080 bytes
font_02_sfnt_off0000939b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939B 4324 bytes

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