Malicious PDF — malware analysis report

Static analysis result for SHA-256 833c319db4c74036…

MALICIOUS

PDF

41.8 KB Created: 2020-08-02 09:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3b2b816dd7c1b19554914fc3622733 SHA-1: 7cdd7236c269193eb81b5e2d32dc46e4a9a7c41e SHA-256: 833c319db4c740364b9e42b695a4c3efed9bccfa8e88bc775d7f324910a451bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'ttraff.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of these links and the heuristic firings indicate a likely phishing or SEO poisoning attack.

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.com/pify?keyword=centos+install+pip3
    • http://files.davidschwartzmft.com/uploads/1/3/1/8/131871835/litarelatezabe-vojevaro-pujuja.pdf
    • http://files.garagedoorsandmotorsipswich.com/uploads/1/3/1/4/131407968/ditev_zatujulugepafak_tetude.pdf
    • http://files.clairesadler.co.nz/uploads/1/3/0/7/130739727/komezapelot.pdf
    • http://files.bellydancewalnutcreek.com/uploads/1/3/2/3/132303001/2f4246908f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1720/7971/files/tomajobososivusinipex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/31376535404.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/56691465155.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/lobufojiteb.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/26351338868.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/medesufaruverukamobawebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1098/files/tobejowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/92430368540.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1885060089.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/wobara.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/vafomolofepiraxug.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_off00006033.bin
5783aa64b37ea107709cb086c8937f4e6a87e6650b77239424b7c4e0c09ef4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6033 4788 bytes
font_01_sfnt_off0000708b.bin
c3acae9aa94a548f0e57ce5764d6cfc5b84a62292ff8c44d03995ad5e47f2997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 13192 bytes

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