Malicious PDF — malware analysis report

Static analysis result for SHA-256 88efcd162926ffb6…

MALICIOUS

PDF

71.2 KB Created: 2020-08-31 05:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e6c1168fa191a34cf3d7e90edaf8de SHA-1: 0ed27e2488ce4922e3607e0336d147387893715a SHA-256: 88efcd162926ffb6755ad152c201ebbf49d0cee8ae8692115a77235bd1682ae7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link to 'ttraff.club', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a calculus textbook, suggesting a social engineering pretext. The presence of numerous external links, many pointing to Shopify, indicates a link farm designed to obscure the ultimate destination and potentially spread malicious content. 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.club/wix?keyword=calculus+ron+larson+10th+edition+pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/krita_export_animation.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/variational_autoencoder_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/taxofudulug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/24588346806.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/zomimomesekilireto.pdf
    • https://static.usrfiles.com/ugd/b8c837_da1f8dafe5cc4902892627a4f428c04b.pdf
    • https://static.usrfiles.com/ugd/b8c837_89cc82cb06bd47df83cc7842ad9e5c91.pdf
    • https://static.usrfiles.com/ugd/33a16d_5774c755e93946128d5aebe97bfc7960.pdf
    • https://static.usrfiles.com/ugd/0d002d_7e7658f5377c483fa7bdb5ada4ad8de0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb7a68ba40f40898af76c2d6bd1c429.pdf
    • https://static.usrfiles.com/ugd/b7ab08_0745f88cb20944e4b7b0e5a16275c65f.pdf
    • https://static.usrfiles.com/ugd/49be48_c56c3dfd975d462ba97e771cf55e9752.pdf
    • https://static.usrfiles.com/ugd/33a2e4_fdb7e536e28c499d83c48e73e553668d.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/trane_xl624_manual.pdf
    • https://cdn.shopify.com/s/files/1/0465/2600/5406/files/bluetooth_driver_for_windows_7_toshiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/wuxiraz.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdcd.bin
99f84f97d0ba639ea0663ab750712982c70d78e39e2c0c63454d530420d25d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 5344 bytes
font_01_sfnt_off0000dfec.bin
fb4e740d0ffc9b88f905c3bb74446692fcd471b828099f6f0b406e49ff48f020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 15120 bytes

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