Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dc4c4e08529ecf…

MALICIOUS

PDF

46.5 KB Created: 2020-09-18 08:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e9cd797c49b56a45c935b3734529625 SHA-1: 41d1e067624fa42a0329c5fea5ada7a2da7a21e0 SHA-256: 05dc4c4e08529ecfd0c61ee8ff22aea50d77f2e165f206db46a621c955d8c213
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO spam operation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.club'. The document body, though heavily obfuscated, contains this redirector URL and several Shopify URLs, reinforcing the link farm tactic. No scripts were extracted, but the presence of a malicious redirector indicates an attempt to lead users to 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.club/wix?keyword=beginning+%2526+intermediate+algebra+6th+edition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/consultative_hemostasis_and_thrombosis.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/magenefizazavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2017/1936/files/22224395738.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/28851860106.pdf
    • https://cdn.shopify.com/s/files/1/0459/7055/5047/files/ncea_level_2_physics_mechanics_2018_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/guideline_hyperuricemia_and_gout.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/safozid.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/las_reformas_borbonicas_en_espaa_y_america.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/majewerizolukewig.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/nunir.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_off00007b7c.bin
c6d7364a0b0f7ef697d644dedf6dbd9129ed54fb2a168b311dc163dc91b884d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 4380 bytes
font_01_sfnt_off00008a75.bin
b2980b2b4c9427e692468df8d9831bda0f85655055f1d96a1dcbc9c78eb3f5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 10712 bytes