Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fef47a6dcfa933…

MALICIOUS

PDF

34.3 KB Created: 2020-08-25 19:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9a3089c61abdd7cbf6a0c44da70aa3 SHA-1: 1c55b76bafe334dc8aaf89cb7b2365a58e36ffb7 SHA-256: 65fef47a6dcfa933536d1d4f4d95a4d9ec815362d3322881482609dd47c915a0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a promotion for Western Digital. The document also hosts a large number of links to other PDFs, likely for SEO manipulation or to obscure malicious activity. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure.

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=western+digital+4808a
    • http://files.xcellroofingqld.com/uploads/1/3/1/6/131608037/b968d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/bionics_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/cambridge_english_business_5_preliminary_student_s_book_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/5422103891.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/27667675891.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/champagne_dress_formal.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/warcraft_3_battle_chest.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/pibevulus.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/voveruxolezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6635/9962/files/50142202215.pdf
    • https://cdn.shopify.com/s/files/1/0459/9906/3199/files/71817439308.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/arduino_uno_programming_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/fedopamusugabumugina.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_off000047f3.bin
7166cb7920b311c60057a7a3bcb85b3c63b63c500fe1bcda68786b9dc3e1de5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x47F3 5428 bytes
font_01_sfnt_off00005a81.bin
890623708d97a0f12f914e8804b4bcdc16d127bd2075ddbd7ff1cf3f7c147d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A81 9984 bytes