Malicious PDF — malware analysis report

Static analysis result for SHA-256 f401a35c63cfd9da…

MALICIOUS

PDF

45.6 KB Created: 2020-08-28 11:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ce5fb96a89ecc82d49001484fb7956c SHA-1: 16938a18f981a188032b73ea18544f29fd85a4b3 SHA-256: f401a35c63cfd9da6f1213df23759e9082bd2eb6bfc5dd968e1626139acaee14
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to potentially malicious redirectors. One such link is https://ttraff.cc/pify?keyword=ejercicios+de+operaciones+combinadas+para+primaria, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to educational material, suggesting a lure to entice users to click the malicious links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Heuristics 3

  • 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.
  • 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=ejercicios+de+operaciones+combinadas+para+primaria
    • http://bivof.rainsweptgame.com/uploads/1/3/1/6/131636725/7ec3947447bb1d.pdf
    • http://files.conor-ryan.com/uploads/1/3/1/3/131379439/451616.pdf
    • http://vesiga.anniesullivanband.com/uploads/1/3/1/8/131871740/58bf96355ebc.pdf
    • http://files.keyboardmelodiesforseniors.com/uploads/1/3/2/6/132681495/7125080.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/cambridge_english_starters.pdf
    • https://cdn.shopify.com/s/files/1/0435/6607/1971/files/d3_angular_directives.pdf
    • https://cdn.shopify.com/s/files/1/0429/4357/8278/files/92768435363.pdf
    • https://cdn.shopify.com/s/files/1/0437/5973/0839/files/burger_king_job_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9144/4390/files/beltenebros_libro_completo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/6461845761.pdf
    • https://cdn.shopify.com/s/files/1/0437/6179/5221/files/kagiriwobuvixibipebigod.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/toyota_yaris_2014_manual.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_off0000681c.bin
8962fd3f8e980ead666e57f95d6dd6470bb1ca7330ab6b1061e7ded3e834fdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 5360 bytes
font_01_sfnt_off00007a34.bin
d2b37db6a711164d92febe9051ececbd59520cea84a046e3dd7b2c9b7bf4470e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A34 15184 bytes

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