Malicious PDF — malware analysis report

Static analysis result for SHA-256 173a74eafb699e4a…

MALICIOUS

PDF

46.1 KB Created: 2020-08-29 23:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e103d80f8d4cbc70743026e50b5b584 SHA-1: a07db960e09847cf1679ff6dc957a836caef429b SHA-256: 173a74eafb699e4a28db4dca00d915a95a13ffcd52a5a9eb687604f7e0526470
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=automotive+battery+size+chart+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9219f8_7b2cde4da23648ae9048b09cf089eb85.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_521167abd9654b4eafc83db18d08d7fe.pdf
    • https://static.usrfiles.com/ugd/be19e1_da5386dc9b6e4dc2b84b25b94f19deb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7298ab926a744f9c8e592a741980f1eb.pdf
    • https://static.usrfiles.com/ugd/fd30ac_a488316bd46c4270be7fe7c3c0397df2.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/gisejijese.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/fuvabewivugukefogevor.pdf
    • https://cdn.shopify.com/s/files/1/0439/2887/9272/files/bikobuwuboduvozokit.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/wofepavanidupunedifaneni.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3085/files/vasisafiwobure.pdf
    • https://static.usrfiles.com/ugd/b8c837_eeeec7059f2c46c69f5ad0e5a6696a2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ba0899f1c3b4c5b88aad73add6155e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a7b79ad55304ee581f461abd5d717e1.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_ae9e5ec4096e4f71b1049b46a688e31a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd07e64e78e742bd9d6d4af57451afde.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_off0000756f.bin
196b2abaf0764f36aed9b6d1d77d4377a2a9b1b539728072fa667b009f06e3e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x756F 5704 bytes
font_01_sfnt_off000088c4.bin
25469f0f71731b6afc07401e678102520e974683f264b5d81909b76542b26fae
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C4 10196 bytes