Malicious PDF — malware analysis report

Static analysis result for SHA-256 27da2a393bfac650…

MALICIOUS

PDF

34.6 KB Created: 2020-08-11 18:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4051c3bc9fd58fdcdccdf20d3aa2bc SHA-1: b2e4518a2b39d8ac1aad6850310cd05a58741186 SHA-256: 27da2a393bfac650b8b2c52a083898c743992a8fe63d8308989e7b4648371d2a
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=block+caving+geomechanics+pdf'. The document body, though heavily obfuscated, contains references to the same URL and other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=block+caving+geomechanics+pdf
    • http://files.osakiselimchurch.com/uploads/1/3/0/8/130813100/fef0fe5.pdf
    • http://files.gracekladnik.com/uploads/1/3/1/3/131397981/besisepewovajo_vanowake_fejupozukamoki_bejuwavibudul.pdf
    • http://files.northcobbphotoclub.com/uploads/1/3/0/9/130969176/7392066.pdf
    • http://files.blancheserban.com/uploads/1/3/1/4/131437701/gezunuwarew.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/zamulobizewinisimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/xunelifoganel.pdf
    • https://cdn.shopify.com/s/files/1/0437/1474/0373/files/79209753136.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/73190042931.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6475/files/31233873846.pdf
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/microbiology_fundamentals_a_clinical_approach_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/system_dynamics_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/57387701530.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/lozijufepelup.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0600/files/sibupobabimasefujezufaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9535/0684/files/56921882600.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/36323673639.pdf
    • https://cdn.shopify.com/s/files/1/0433/9010/7815/files/english_speaking_practice_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66923604261.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/medical_surgical_nursing_javed_ansari_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004855.bin
00835b11217c9dc88194e5934f1bc93acb42003deda6eabeef5e4371f03f4eb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4855 5648 bytes
font_01_sfnt_off00005b6e.bin
1a02acd34484a8985ca337ee3237fad496b778cd63a1243c3e75fee9ee70c108
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6E 9972 bytes