Malicious PDF — malware analysis report

Static analysis result for SHA-256 6562acc52619e1bd…

MALICIOUS

PDF

40.4 KB Created: 2020-08-26 23:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e820e5bb8d0943914027e067e2a5796 SHA-1: 8c7b6dd284095c25863d651c8a5ff39ce4927f7c SHA-256: 6562acc52619e1bd69b47a75c6d9d4c2182329510182500186c249a85f5e8bca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, indicating it is designed to lead users to harmful content. Additionally, a high number of embedded links to other PDFs were detected, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

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.cc/pify?keyword=%25D0%25BA%25D0%25B0%25D0%25BA+%25D1%2581%25D0%25BE%25D0%25BB%25D0%25B8%25D1%2582%25D1%258C+%25D1%2581%25D0%25B0%25D0%25BB%25D0%25BE+%25D0%25B2+%25D0%25BE%25D0%25B3%25D1%2583%25D1%2580%25D0%25B5%25D1%2587%25D0%25BD%25D0%25BE%25D0%25BC+%25D1%2580%25D0%25B0%25D1%2581%25D1%2581%25D0%25BE%25D0%25BB%25D0%25B5
    • http://funiteba.univerdant.com/uploads/1/3/1/4/131437462/a6d1abefa3556.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/pozefolekarulemiwetirida.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/suzararoxetub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/vefinopoxiwalezinad.pdf
    • https://cdn.shopify.com/s/files/1/0464/9045/2120/files/converting_radians_to_degrees_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/types_of_antonyms.pdf
    • https://cdn.shopify.com/s/files/1/0428/8089/3084/files/96791881998.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/58374122197.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/10202264997.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/livigepemulasetarivejulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/soviwirobenikebosekis.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005434.bin
7efc0049d245cd27035d8aba43e252380355b271b933d86d1d8fa7d967ac189c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5434 5752 bytes
font_01_sfnt_off0000675d.bin
2030b8b8be516091341019f70a6022c84bdd3cf3670e6d7240b9881d78d4f539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675D 13516 bytes

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