Malicious PDF — malware analysis report

Static analysis result for SHA-256 757189a8a068f640…

MALICIOUS

PDF

116.8 KB Created: 2020-08-19 01:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aea96be294995721785fbec269d91e54 SHA-1: dd8b5e432725eb88ffd86928ba511f5e7751a95a SHA-256: 757189a8a068f6408cc793c994caa41104e8c085e73f8e6a9a112fc2a45f584e
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc). This indicates a link farm designed to obscure the final destination and potentially distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports this assessment. The document body contains text related to medical guidelines, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=fungal+peritonitis+treatment+guidelines
    • http://renedur.redneckinnovation.com/uploads/1/3/1/8/131856979/xavuxa.pdf
    • http://files.lorainedavies.com/uploads/1/3/0/8/130814644/povutameseboji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/alvaro_siza_obras.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9738/files/dyslipidemia_guidelines_canada.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/allergens_in_food.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/66846413780.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/66184555894.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/xunujofakovilivu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8565/0325/files/calvarial_bone_graft_harvest_technique.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/pozurumufoxoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0087/files/acta_constitutiva_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/87698677979.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/tilenafinegunasadikazan.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_off00017886.bin
79d7fc65c7ff82d642176382bf5d5ba1a8dca9e91e5fe2c913b09dfeda6dd543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17886 5236 bytes
font_01_sfnt_off00018a3e.bin
01e6dc8f9987b3c1311a4a47f217954c95b93d8264e2424d875ad2a7112b3186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A3E 11516 bytes
font_02_sfnt_off0001b02d.bin
ce55ea6cbae09b9f457b4bddb423f762e65a5598dfa48e4f78c2d33149a921d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B02D 16156 bytes

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