Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1586bfd9e5bcd28…

MALICIOUS

PDF

60.0 KB Created: 2020-07-22 10:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 211445e4f1f4f441346f5deb3a95a202 SHA-1: 029f3775c0642e519a743b3a878a3274e77a9d0b SHA-256: d1586bfd9e5bcd28f28bb6eb0a15c620a12e88e634a0fed3caa954b512899d48
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, flagged as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://ttraff.ru/wb?keyword=gobiernos%20militares%20de%20bolivia%20pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the link farm and the malicious redirector strongly suggest an attempt to lead users to harmful 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.ru/wb?keyword=gobiernos%20militares%20de%20bolivia%20pdf
    • http://files.wiast.org/uploads/1/3/2/8/132815882/533524.pdf
    • http://files.hyperventila.com/uploads/1/3/0/9/130969986/3923061.pdf
    • http://files.paulhorsman-author.com/uploads/1/3/0/9/130969184/5bd23719d759.pdf
    • http://files.60secondphilosophy.com/uploads/1/3/1/8/131860204/9325265.pdf
    • https://www.noticiasfides.com
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/24881957944.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/30482244845.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/13128314535.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/ponagabavut.pdf
    • https://sifodupaw191158614.files.wordpress.com/2020/06/juzejotiwejorili.pdf
    • https://zebivosolov.files.wordpress.com/2020/07/54719427457.pdf
    • https://kunaganit.files.wordpress.com/2020/06/48079186986.pdf
    • https://zedovase.files.wordpress.com/2020/06/40716058869.pdf
    • https://devejav.files.wordpress.com/2020/07/rebumosetolelokuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/68755008986.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/rebukikedimoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/82754012805.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/jasuwidijevi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/67306973534.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/burebeduten.pdf
    • https://cdn.shopify.com/s/files/1/0434/2959/3245/files/54979330574.pdf
    • https://cdn.shopify.com/s/files/1/0431/3274/7927/files/jijadulebexepanum.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_off0000a1da.bin
311045df3db4c33cb5a0b66a3ee7017e757f86087f33f1cf252ffd43a745b7b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1DA 5208 bytes
font_01_sfnt_off0000b374.bin
ec853120b92cb421460e071cc8a5737f026b54f1a25b33949442bdbacd04b29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 15208 bytes

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