Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac8471b93f63637…

MALICIOUS

PDF

45.9 KB Created: 2020-08-08 23:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95952ecba8f719d46a87749c43c6d15 SHA-1: 0c100a070d9df80ae9bb240eb96e1ebbfea707c6 SHA-256: 0ac8471b93f63637675bc9b16ab100f1e7e3e2e27748e33831609fa1d35629e0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'academic writing pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicates this PDF is designed 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.cc/pify?keyword=academic+writing+pdf
    • http://mojenut.quantumeffectswitherika.com/uploads/1/3/1/3/131381078/59ba867ec.pdf
    • http://files.treatsicecreamparlour.com/uploads/1/3/0/8/130814466/bc4b4a471f.pdf
    • http://files.coastalvapers.com/uploads/1/3/1/4/131455158/667ccf9fa.pdf
    • http://files.cottontailcottage.org/uploads/1/3/1/4/131408970/xutaxegowaki.pdf
    • http://files.markwatsonwilliams.com/uploads/1/3/2/6/132695629/zulikaj-dulil-maguxajasowafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/56002415729.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/how_to_prepare_cash_flow_statement_direct_method.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/15594403211.pdf
    • https://cdn.shopify.com/s/files/1/0429/4888/6684/files/bsc_physics_1st_year_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/dobuzezarekofanudonokebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kamunikizesow.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/68969251355.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/gotham_font_family.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3533/files/jajif.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0768/files/31724898310.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/vofedazelakinitan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9894/files/pearson_mastering_physics_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/49570720313.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_off00007668.bin
75164845d1089888a964efa3977b420c56e70afd62426f9071fa1701cdf39985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 5344 bytes
font_01_sfnt_off00008897.bin
e11f2aa16d3efbcbcf24d7a8e1c1d4ed9ac84dc5298c1bcc2022548c86ab5c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8897 10252 bytes

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