Malicious PDF — malware analysis report

Static analysis result for SHA-256 420ccadfde1502ea…

MALICIOUS

PDF

45.6 KB Created: 2020-08-31 09:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 319d292f395ddb9afede4d725bc459f8 SHA-1: 10d00e7219647fdfe708aaddd8c9b353c3178013 SHA-256: 420ccadfde1502eaec34546db52b699c9a67aec25135d790e55ae196c6a0c421
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Steam hours played' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy to obscure the ultimate destination.

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=steam+hours+played
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/logical_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/4246530290.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4245/files/tetidalemawofixogo.pdf
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/56174601781.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_5a65f1611278456187658cead09ee21b.pdf
    • https://static.usrfiles.com/ugd/c3f88d_aef86cc888544dcb8b78ca9b94b81d0b.pdf
    • https://static.usrfiles.com/ugd/7a11b0_867ed80b515340e0896706e63215c438.pdf
    • https://cdn.shopify.com/s/files/1/0439/4670/5051/files/42435602125.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1665/files/corrugated_carton_box_manufacturing_process.pdf
    • https://static.usrfiles.com/ugd/b8c837_a51bde549a4b435ea3aabcaf1a2a355d.pdf
    • https://static.usrfiles.com/ugd/b8c837_aac472d0d2e94c5cb07ef860891dd7ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_02b4302d4f1043058007fd589118c5d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_91d29f0c93c547c0a93f18a9c21689ae.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006674.bin
e4a050b47138d2eff27e87756d26ab002c53c76c352fe97064d50546d7180c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6674 5132 bytes
font_01_sfnt_off000077e9.bin
14c0ed63516cf119bf79ee46dd03614956c8680d136ed9bc1e454783ceec7cea
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E9 10444 bytes
font_02_sfnt_off00009b93.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B93 4324 bytes