Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a76f32d5102e38d…

MALICIOUS

PDF

73.0 KB Created: 2020-08-06 19:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 363666523554629e4a341547dcaeea82 SHA-1: 056b1ed81d98fce72134dab37d2dd995a3a60ad3 SHA-256: 3a76f32d5102e38d4e93a6639a67dbd894edcca062f2705b38ba738ff8498f50
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=anger+management+pdf+file'. Another heuristic indicates a PDF link farm, suggesting the document is designed to drive traffic to external sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is a lure for malicious content.

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.ru/pify?keyword=anger+management+pdf+file
    • http://files.agriculturalmuseumnb.com/uploads/1/3/0/8/130813510/6855062.pdf
    • http://files.laurenstripling.net/uploads/1/3/0/8/130813489/megujaletobin.pdf
    • http://jilaremid.marinelifeproductions.com/uploads/1/3/0/7/130775432/wuxesipuv-wakafolepawab-xarapoxevaxiwo-kabuguxaxatu.pdf
    • http://namal.uglypixelicious.com/uploads/1/3/1/3/131398091/babobivewal.pdf
    • http://files.thelittlebull.com/uploads/1/3/0/7/130738675/2be10.pdf
    • http://files.laurenstripling.net/uploads/1/3/0/8/130813489/megujalet
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/8765051804.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/44847411919.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/18809588797.pdf
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/jiluda.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/11804612137.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/2315952685.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/29716736512.pdf
    • https://cdn.shopify.com/s/files/1/0437/5085/0709/files/14822503812.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/rofimapujemalugidulekokel.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/80616603998.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/mobojine_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/86451701196.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_off0000e046.bin
476e681b6b49f41d203e4476806cac62a33cd4973304be2d7bf1b4f68f65885c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 5172 bytes
font_01_sfnt_off0000f1d0.bin
e26db0ce2ddf5f46ee3add61eef10c4e02df9abe7cb16194e8552b69785e6007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10908 bytes

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