Malicious PDF — malware analysis report

Static analysis result for SHA-256 578f98a82c227ea8…

MALICIOUS

PDF

66.7 KB Created: 2020-08-10 23:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d2ac35f74f55b936ece2de4af9e0d42 SHA-1: 06b0a5430b51988f0db0642751570333eda5312b SHA-256: 578f98a82c227ea8bf6e634225f9b77e5357017f1de0da2b3de25a10db7fd6ef
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=cumulative+frequency+graphs+pdf'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to Shopify domains, one of which is 'https://cdn.shopify.com/s/files/1/0436/1935/2740/files/78643490864.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL as the redirector.

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=cumulative+frequency+graphs+pdf
    • http://files.eyemaxmono.com/uploads/1/3/1/1/131164383/zivakajamoj-xivapafodi.pdf
    • http://files.bssc.ru/uploads/1/3/0/7/130738830/3701754.pdf
    • http://xogofem.columbiapsychmd.com/uploads/1/3/0/7/130739113/0b9d7097.pdf
    • http://files.shallowflycompany.com/uploads/1/3/0/7/130775350/4621034.pdf
    • http://files.ohiomorganhorse.com/uploads/1/3/2/7/132712093/3071053.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/78643490864.pdf
    • https://cdn.shopify.com/s/files/1/0433/0278/1083/files/lorikofasofilus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/8284212530.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/desame.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/37418571941.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/kopavexijixesidaniko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61238086127.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/tesabepevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/pifusegelab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/garexixikuzuzede.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/75264786350.pdf
    • https://cdn.shopify.com/s/files/1/0430/3755/6889/files/xoxibezokigifelem.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_off0000afab.bin
37a5a6343e01ee311385d2248a86e6b9c469be99cb9ce1c7fc2a49af2c80fa1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 5652 bytes
font_01_sfnt_off0000c2b7.bin
d0b9498527fa6a55ee3bda52a6fa6d63072c6c683d1e5bd0fa4c054a5036e026		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B7 14484 bytes
font_02_sfnt_off0000ef5d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 4324 bytes

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