Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a5c698dc88988d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 02:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33a014fd36962173a71408a694cbf66 SHA-1: d29010db48d73d853ba4cf1372f462fb7396c8f0 SHA-256: 66a5c698dc88988d0a27274d20cdf109be65171d394356aa8facd4becfbc4614
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The primary malicious URL is https://ttraff.ru/pify?keyword=fishing+barents+sea+king+crab, which is likely used to redirect users to a phishing or malware-hosting site. The document body, though heavily obfuscated, contains this URL and other PDF links, supporting the link farm and redirector findings.

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=fishing+barents+sea+king+crab
    • http://nemedivo.afrisekgroup.com/uploads/1/3/0/8/130814328/8f469.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/pimot.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/6417092025.pdf
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/wordly_wise_300_book_8_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/pavavukigarakal.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/matixeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/burnaware_shaper_pro.pdf
    • https://cdn.shopify.com/s/files/1/0431/5060/6497/files/analytical_chemistry_multiple_choice_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/rerode.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/29243348732.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/bavusimagividozipob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005984.bin
f24fd62e98b425dc9cfb5a102afd4cabc199a5276ff8703285a8bfedfa3629de
pdf-font-stream PDF embedded font (sfnt) at offset 0x5984 5188 bytes
font_01_sfnt_off00006b14.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B14 1800 bytes
font_02_sfnt_off000073a2.bin
1e219b4eb2c072e5021c46a8d67f2647ecf53123bb7f2d427c7198a918de3be8
pdf-font-stream PDF embedded font (sfnt) at offset 0x73A2 10580 bytes