Malicious PDF — malware analysis report

Static analysis result for SHA-256 664e6e8879463cfb…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 11:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01b8d5a64ea6cbf7ff702e4652a91314 SHA-1: addaddd5e882d4127b9da326c82d0c6cb6c27250 SHA-256: 664e6e8879463cfbf64daf35c7fbbc6d958fd49de0251e24c1b26165229ebb7a
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text referencing 'Warframe primed stretch', directing users to a suspicious URL (https://ttraff.ru/wix?keyword=warframe+primed+stretch). This URL is flagged as a malicious redirector. The PDF also contains a large number of external links, many pointing to user-uploaded content, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicates maliciousness.

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/wix?keyword=warframe+primed+stretch
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b65acf_b7198d7fd1944474a45de7837c80a473.pdf
    • https://static.usrfiles.com/ugd/c1108c_5f6b78434fa34ad58d79088b2aedc5ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_4acb61775aba4814b8ffe6d21a0a440a.pdf
    • https://cdn.shopify.com/s/files/1/0466/5842/0901/files/15667005304.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/56205623830.pdf
    • https://static.usrfiles.com/ugd/c836c3_dc9589ecd46e414bb4522b065ab46a82.pdf
    • https://static.usrfiles.com/ugd/b8c837_f989ac2ba76d4abba6e204ea626b5b00.pdf
    • https://static.usrfiles.com/ugd/b8c837_e175e5fc7a024085aeb4e680d025616e.pdf
    • https://static.usrfiles.com/ugd/b7306e_11bbdb029b994afab10b3fe30a55d66d.pdf
    • https://cdn.shopify.com/s/files/1/0436/9160/6170/files/ancestral_guardian_barbarian.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/spring_framework_tutorial_for_beginners.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_off0000719c.bin
7af2c358b96f5adc119b34413f9f1559f2f2056ccb75a28dadf382e77dc6a436
pdf-font-stream PDF embedded font (sfnt) at offset 0x719C 5376 bytes
font_01_sfnt_off000083cb.bin
513616c5d932d08673bad7408b4416cad4295ab65ff32f0579c392795d382114
pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 14348 bytes