Malicious PDF — malware analysis report

Static analysis result for SHA-256 0653fc9e5d58cfb7…

MALICIOUS

PDF

42.0 KB Created: 2020-08-09 08:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0818c60159cf63b62d8f99b4d84ec6c SHA-1: 16fe54b3ecf3859b157b78a91ebf93864f165216 SHA-256: 0653fc9e5d58cfb7f09c1e51b52d31a9c026fabd1627a79fc95a1c8164fd369b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many of which point to a redirector infrastructure known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure, suggesting the primary goal is to redirect users to potentially harmful 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.cc/pify?keyword=assam+tribune+today+newspaper+pdf
    • http://files.castlewoodclays.com/uploads/1/3/1/4/131406222/5433307.pdf
    • http://tupak.lillianchun.com/uploads/1/3/0/8/130874493/nevemaxur.pdf
    • http://fures.paolaniebla.com/uploads/1/3/1/8/131856372/3412312.pdf
    • http://files.jimhallahanconstruction.com/uploads/1/3/1/4/131483147/daduxoxeziwoxubim.pdf
    • http://files.lincolnperformingarts.com/uploads/1/3/1/3/131398560/12b87df604610de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5667/6510/files/telolitanifaxeteroranavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/4414/2245/files/57284439770.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0108/files/377086886.pdf
    • https://cdn.shopify.com/s/files/1/0429/4901/7756/files/42687763187.pdf
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/22876873218.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/dajuvutebifurutupapet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/98851028097.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7688/files/faligo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/39501592985.pdf
    • https://cdn.shopify.com/s/files/1/0438/2549/6221/files/63273482355.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f6.bin
99c1d818aa1a0d7ef0aa14f9aaf888467e3f5c2fd8f95cab077cd5aef12f2c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F6 5480 bytes
font_01_sfnt_off00007694.bin
525311fa7f3afd749d99662da7aa9dd81abca5d1b68b29e0c021f5dfa7a32d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7694 10888 bytes