Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3e3f99df25d0d1…

MALICIOUS

PDF

43.4 KB Created: 2020-07-31 07:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c92dae9fe945ac2d4f5cae0f35159a86 SHA-1: efcf3280337d25880d4f77d65ad93303759893a5 SHA-256: 2c3e3f99df25d0d1589f7df6d2f0ddc052ef0ab2e7a73fd03afd62ebf6f29a60
152 Risk Score

Malware Insights

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

The PDF contains a link farm with 13 external PDF links, many hosted on Shopify, designed to appear as legitimate search results for a PDF download. One of the primary links, 'https://ttraff.cc/pify?keyword=coded+blood+relation+questions+pdf+download', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of the link farm and redirector strongly suggests a phishing or malware distribution attempt.

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.cc/pify?keyword=coded+blood+relation+questions+pdf+download
    • http://files.woodsmuir.com/uploads/1/3/1/8/131856186/26ca25d6e3c266.pdf
    • http://files.gwgproductions.com/uploads/1/3/1/0/131071067/01e3bb7b8e8f55.pdf
    • http://files.fossilridgetheatre.com/uploads/1/3/2/6/132681664/512b94f.pdf
    • https://cdn.shopify.com/s/files/1/0436/9694/7353/files/11403622072.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/zafedujojujefurapalire.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/36148882914.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/37022323852.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/zelebewomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/durew.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/36933438516.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/vejezuron.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/mogivenamug.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/87715639758.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/
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a16.bin
95ab44267b55658c5ad51bea8066029db025d9beda320f124a0689f6387b4d39
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A16 5296 bytes
font_01_sfnt_off00007c2e.bin
7010bf581dd3d18b5eea560612683fdfab73a148129156ba54b99308159a471c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 10732 bytes