Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a735a14a604fbcc…

MALICIOUS

PDF

42.7 KB Created: 2020-07-27 19:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 130c5d7c9bb06b5d72ec773982a99fe0 SHA-1: 2b358b4fcf4a932ede2f1da9d7faf7f6a89954a1 SHA-256: 8a735a14a604fbcc790819ed1bdde590f959135c85995246e4dacbbf24755e47
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics indicating it is a malicious redirector and part of a link farm. The primary malicious URL identified is ttraff.com, which is known to host redirector infrastructure. The document body appears to be corrupted or heavily obfuscated, preventing a deeper analysis of its content, but the presence of numerous external links, many pointing to shopify.com, suggests a tactic to distribute or mask malicious content. The ML classifier also strongly indicated 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.com/pify?keyword=rounding+decimals+math+drills+answer+key
    • http://files.jagartsupply.com/uploads/1/3/1/4/131453577/wuxepo-sodog-jolefafoduz.pdf
    • http://files.ipdutexas.org/uploads/1/3/1/4/131406520/9307e.pdf
    • http://files.knightcsf.org/uploads/1/3/0/8/130813413/wisovesipetelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/69182078097.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/16506608841.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/88515233032.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/wetajigewugixob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/borutazaweluv.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/wazadozewowu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96626323422.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/basolevezobapasekiberidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6354/9845/files/66734575725.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/nubanudubetukibofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/51443922919.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/
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/wetajigewugixob

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069fb.bin
3bd8bbeb484c8b098e8fa9dd16f0ce3b03a4a3b6c051f6dcae7389e7f3a95934
pdf-font-stream PDF embedded font (sfnt) at offset 0x69FB 5500 bytes
font_01_sfnt_off00007c94.bin
4448ef22473e2c5db572e4603230f7aac8a1047eb6c6baac7b4e080a0530a80d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C94 9656 bytes