Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d7280056f99d89…

MALICIOUS

PDF

56.6 KB Created: 2020-07-31 13:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4da3cf7b316e290563e8188e3479d8 SHA-1: cbfebb5ffaec5d3c0e3b7e46e5236b9ceae3706b SHA-256: e0d7280056f99d890e03c562ff53a5585379dc091ee6f967104d5dba5b07f65e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary link directs to 'ttraff.com', which is known malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'circle theorems questions and answers pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=circle+theorems+questions+and+answers+pdf
    • http://files.malachytallack.com/uploads/1/3/1/6/131606127/9990791.pdf
    • http://files.ay-kay.com/uploads/1/3/1/6/131637853/202964.pdf
    • http://files.cowboycookinwickenburg.com/uploads/1/3/2/3/132302923/piweja.pdf
    • http://files.weyemilab.com/uploads/1/3/1/4/131437418/lemor-vatazidobe-vevevidagogifot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/14354691671.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/vuguvijetub.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/lotopagijevipovizulegut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/46216484199.pdf
    • https://cdn.shopify.com/s/files/1/0433/5307/9963/files/33161710508.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/teripuzuganilivowokibojeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3036/files/zakawuxegokevajedijiruvuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/dajadiruzevefef.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/71977699658.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/xopusigiromulom.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/76998730325.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/1/0437/2607/8106/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000967c.bin
497165dfe926d6a87f993909a41fbbbd79867c025836c9f050b6b109230f74e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967C 5516 bytes
font_01_sfnt_off0000a91f.bin
592cc827aae0115c112de1282756d1bfca98f010de01794f5d20475bfa784a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91F 14032 bytes

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