Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9d6d3674cebfca…

MALICIOUS

PDF

41.0 KB Created: 2020-08-14 01:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c4cf150d34ce4ba836f165a49a11e5 SHA-1: 8345b98de60012ba2538be193e3be50692c78f57 SHA-256: 3d9d6d3674cebfca9be54fa7ba62b5f648aba29a2f1fdd3afbbe699ffc1813db
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is `https://ttraff.com/pify?keyword=politika+%25C4%258Ditulje+format`. The document body is heavily obfuscated but contains references to the redirector and other benign-looking Shopify URLs, suggesting a link farm designed to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness.

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=politika+%25C4%258Ditulje+format
    • http://sepixoba.30westfitandrec.com/uploads/1/3/0/7/130776394/a40a6e3ae3c5c5.pdf
    • http://midifepa.hydrocitizenship.com/uploads/1/3/0/7/130776330/kerezexupu-dotolinetiw-safiko.pdf
    • http://files.shekhargn.com/uploads/1/3/1/4/131453733/96ede.pdf
    • http://files.xavierlecouturiermusic.com/uploads/1/3/1/4/131406701/ea22f.pdf
    • http://files.fuzzfaced.net/uploads/1/3/0/9/130969659/8cf5ee4b.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/camera_raw_9._1._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/1296667065.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/rugofototadekodeni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/18700457013.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/mapilawavusomujiwosogis.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/27196731065.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2535/files/animator_s_survival_kit_richard_williams_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/0186/1528/files/vogetebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2145/files/free_calligraphy_worksheets_printable.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/42684354057.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.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_off00005980.bin
f27a07377002ed122736a0221b333f08c5502e77ba15077fb8bf5f934486a9ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5980 5020 bytes
font_01_sfnt_off00006a83.bin
95a7ff223c17d87b2fd3707490e938fcd15d19c9e70117422c1cec987ac65652		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A83 14676 bytes

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