Malicious PDF — malware analysis report

Static analysis result for SHA-256 f447871e517f0b46…

MALICIOUS

PDF

46.4 KB Created: 2020-11-01 13:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f83bb37edbf8561ec70a3a841927b5c SHA-1: 740727e3c3648dad0c3604602f4957937f066244 SHA-256: f447871e517f0b46b5a6e0c42ad596d202ab3a50c44779b1453bfc4b57c47a97
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector. This suggests the file is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing. The presence of a large number of external PDF links also indicates a link farm, potentially for SEO manipulation or to host further malicious 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://gettraff.ru/strik?keyword=starcraft+guide+pdf
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5f91c7d94338d.pdf
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f92b6e4e5f80.pdf
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8b4042169d1.pdf
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5f8fcf08ecf89.pdf
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f87c51c65f19.pdf
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f8df463c2762.pdf
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f8cadb50e049.pdf
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f934ed13d16d.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f9b1520aace0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0495/6690/8572/files/philips_saeco_poemia_manual_espresso_machine_hd8325_01_class.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3652/files/net_ionic_equations_practice_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0268/7349/5742/files/96587478316.pdf
    • https://s3.amazonaws.com/gopuze/jibevunewusemago.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_off00007758.bin
eab5da51eccc3ffaa170da31a303c932b8588fd27b2df4044534fb56136776af
pdf-font-stream PDF embedded font (sfnt) at offset 0x7758 5216 bytes
font_01_sfnt_off00008925.bin
423d711af15dc0334023691fde1875e3dd0accee8d9aede6af0ff527cbba7fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8925 10524 bytes