Malicious PDF — malware analysis report

Static analysis result for SHA-256 8587b6dbcb4664dd…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 05:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16462a68c9d595116bb94355d422c5ad SHA-1: eadfd2d7ac3ed368db34956aeae15b4a47c5774a SHA-256: 8587b6dbcb4664dd01bfd6c50e18a8c39709c3119a77deb5f0eee3b583f728ad
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or redirection scheme.

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=candlelight+carol+sheet+music+pdf
    • http://files.northshorebaptist.org/uploads/1/3/1/4/131453897/1183795.pdf
    • http://files.mahakaitreasures.com/uploads/1/3/0/8/130813320/77e936.pdf
    • http://xujuze.pthscap.com/uploads/1/3/1/4/131453060/dumirux.pdf
    • http://files.centermentalhealth.com/uploads/1/3/1/1/131163920/podejefudededidobu.pdf
    • http://files.phktsda.com/uploads/1/3/1/4/131438245/c53a9652.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/66344975582.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/85246766275.pdf
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/wifinowixuvurizejof.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/21091978459.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/busaveketa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/36094598616.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/gomijabakefuvajo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/wevusenilumogegero.pdf
    • https://cdn.shopify.com/s/files/1/0432/3541/0077/files/59211310088.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/43517794342.pdf
    • https://cdn.shopify.com/s/files/1/0433/4760/7720/files/react_file_upload.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/tezemag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lezoxaxus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000536a.bin
e0d1aa57d46fdf3bcb1aa1b042bf914d33dcfc41cad6ecb78f1ff1041bb37ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x536A 5476 bytes
font_01_sfnt_off000065d6.bin
1d22350725959da23dbe9637130a7f259ec6e348b54d5c2dbf2b94863255eb80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D6 9940 bytes
font_02_sfnt_off000087d3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D3 4324 bytes

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