Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec23494d1ee3ca4…

MALICIOUS

PDF

52.1 KB Created: 2020-08-30 18:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a35358894e432b2a3859fd4bf627541b SHA-1: 442369d4e86efedd33ca125a2e8aec6bda25aede SHA-256: 8ec23494d1ee3ca4ed84d678663ac64060c32e64f8f4e132731d934231259689
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=acertijos+matematicos+para+ni%25C3%25B1os+de+primaria+pdf'. The document body, though partially corrupted, contains text related to 'Acertijos matematicos para ni os de primaria pdf', suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to distribute the malicious PDF.

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.ru/wix?keyword=acertijos+matematicos+para+ni%25C3%25B1os+de+primaria+pdf
    • https://cdn.shopify.com/s/files/1/0430/9902/9655/files/52022623442.pdf
    • https://cdn.shopify.com/s/files/1/0437/5566/7605/files/xactimate_28_training_workbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/xuges.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/nevadisitivinoguket.pdf
    • https://cdn.shopify.com/s/files/1/0462/7372/4576/files/salegatimozu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/54709703697.pdf
    • https://cdn.shopify.com/s/files/1/0433/1841/1417/files/wilerofepidiledapi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/medicare_benefits_policy_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/5335804912.pdf
    • https://static.usrfiles.com/ugd/b8c837_93879a5317f44462a68c02a82ce7a5da.pdf
    • https://static.usrfiles.com/ugd/b8c837_277be9e0bb5047dc8b8d9105d319aac5.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006528.bin
4008070b820112bfa778bc7c1e0c2cc083df021307dbb17d7c0a7c35aecee560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5336 bytes
font_01_sfnt_off000076e0.bin
122152643e7ebc8079f05e1b48cdeb76bc53a4631d78e1ef1678bfee2fa3be32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E0 11652 bytes
font_02_sfnt_off00009cae.bin
c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAE 16376 bytes
font_03_sfnt_off0000b256.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB256 4324 bytes

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