Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc73c675cf2b15f…

MALICIOUS

PDF

48.5 KB Created: 2020-08-06 01:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e13684c6a65499ffabf70fc491b90b2c SHA-1: 88556f6969544a36aa7f8b563a876a180595d126 SHA-256: 5cc73c675cf2b15fa0811cc5178fb0710fe5d8cc03069df936b444c55dbb2386
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=epistaxis+pdf+tratamiento'. The document body, though heavily obfuscated, contains text related to 'Epistaxis pdf tratamiento' and mentions 'wkhtmltopdf', suggesting a lure to disguise malicious content. The presence of a link farm further indicates a malicious intent to distribute links.

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=epistaxis+pdf+tratamiento
    • http://files.shispa-benefits.com/uploads/1/3/1/0/131070367/9857876.pdf
    • http://pifigum.bohemianblackart.com/uploads/1/3/1/6/131636725/mosujo-maralugivaf-lopatazowiwuf-wilozup.pdf
    • http://files.designsbycarolann.com/uploads/1/3/0/8/130814513/ac27058e6e8.pdf
    • http://bubefot.kahaboutique.com/uploads/1/3/1/4/131437601/8128726.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7132/1752/files/5736201291.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5029/files/sexagugerexokijumapiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3784/files/surah_ar_rahman_bangla_uccharon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/mibanedasaferomaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/7895/9775/files/tizopa.pdf
    • https://cdn.shopify.com/s/files/1/0438/6809/4629/files/technical_communication_10th_edition_mike_markel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/19929355024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30036161276.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/60681681300.pdf
    • https://cdn.shopify.com/s/files/1/0428/5395/7799/files/jifabejamezexula.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_off00007fd8.bin
fcca5df51f2a5bb5b1301a611184ccf8f3ab278295e5b43a47d323386b610f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD8 5180 bytes
font_01_sfnt_off0000916b.bin
9c6620ab28e1827548d8669d964f2d4009f3406e55f5545946de5e91a2133760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x916B 10588 bytes

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