Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e2b54da4183e94…

MALICIOUS

PDF

70.4 KB Created: 2020-08-08 16:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 621f12a92e6abffd2c2cdbd91680a72e SHA-1: 335d3fca11d154cb2711ae9a8cad19472a50f376 SHA-256: 18e2b54da4183e9472deca85c2e85da847b1bd76b7e15671f69801911b551513
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users to harmful sites.

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=accounting+equation+questions+and+answers+pdf+class+11
    • http://files.thepartitionarchives.com/uploads/1/3/2/6/132696598/6533251.pdf
    • http://xiboxuki.birthingdivine.com/uploads/1/3/1/3/131383544/nurak.pdf
    • http://files.flyawaykate.com/uploads/1/3/0/8/130874317/4534322.pdf
    • http://files.cismaths.co.uk/uploads/1/3/2/8/132814929/zijiru.pdf
    • http://files.polarstaryouth.com/uploads/1/3/1/3/131378776/8914340.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/pdf_reader_kindle_alternative.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/71395214239.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/13777942259.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/leragogipaniv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/30614063718.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/36954842988.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/6029160314.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2984/files/diweluw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/47603719125.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b55d.bin
087481057ecadf58ebc73d67632ddb81c67529406c22240725265191ff55e710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 5584 bytes
font_01_sfnt_off0000c87a.bin
0bdee5cf8e884835520be134306ff3394604ff2bd7d9c408b33d878f9ad6818f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 14884 bytes
font_02_sfnt_off0000f6b3.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 16164 bytes

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