Malicious PDF — malware analysis report

Static analysis result for SHA-256 50714a2f876eedf0…

MALICIOUS

PDF

53.2 KB Created: 2020-08-10 21:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20ebc27d2d96f54bea41ebf169a0d37 SHA-1: 3a1411a3d3634c06778cb67be6dd8e3c76ba4bc1 SHA-256: 50714a2f876eedf068565eee6a7d6029333a8ced72ea4637190117f2397d7e8a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body text is garbled, but the presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt. The primary malicious URL identified is https://ttraff.ru/pify?keyword=chapter+4+time+value+of+money+pdf, which is flagged as a malicious 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.ru/pify?keyword=chapter+4+time+value+of+money+pdf
    • http://files.flashfitnessresults.com/uploads/1/3/0/7/130739895/garuvedikaxaxow_pawolozawisakev_gibex_lodakanakemi.pdf
    • http://files.bigislandbowls.com/uploads/1/3/1/3/131381363/d17f8a301d0.pdf
    • http://files.kiliriseadventures.com/uploads/1/3/1/3/131398006/4158900.pdf
    • http://fejebi.amymaddoxphotography.com/uploads/1/3/1/1/131164250/8350555.pdf
    • http://zaduzuzem.ceciliabramhallart.com/uploads/1/3/2/7/132710714/a671a.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/setujesos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3216/7068/files/xituzikifob.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/zaboxelatep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2267/files/24156532575.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/diwodojudesopojutotopi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6075/4582/files/vajiram_and_ravi_ancient_history_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/vikumoredaresasor.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/doraxofafal.pdf
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/15872331419.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65496272691.pdf
    • https://cdn.shopify.com/s/files/1/0439/7318/1598/files/75197025468.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_off000083e4.bin
8129e9fc61349a81a1b177150f77fd86652e46632087c3d8bdb68070401f5d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E4 5260 bytes
font_01_sfnt_off000095bd.bin
98537033c8f9a2c6b6c258e64f2b2e14c74ee6cef95c01f349521be01ffa7b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95BD 16252 bytes

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