Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a31226869e0003d…

MALICIOUS

PDF

47.0 KB Created: 2020-08-29 20:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 615cdb2f6ff30857790131ee43653371 SHA-1: d179ab88d816dae226274e8ba94c87024a2defa4 SHA-256: 4a31226869e0003d4885af2f215d833f7c03fb7079f2f36d1c6f0dc49416e358
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Caterpillar identification guide' and the malicious URL. This suggests a social engineering lure to redirect the user to a potentially harmful site.

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.ru/wix?keyword=caterpillar+identification+guide+sou
    • https://static.usrfiles.com/ugd/b8c837_99d91dbbce9b448ba795b7bd3e02dcd4.pdf
    • https://static.usrfiles.com/ugd/c5d40f_ef8f61cd6c0e4ddfade1a3a80eafdd45.pdf
    • https://static.usrfiles.com/ugd/921909_769502688adf45a69fa64a52c0033f76.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7603f3b730b4ec0a5627ef94f09ea5f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/46853561076.pdf
    • https://cdn.shopify.com/s/files/1/0437/5438/9665/files/canny_edge_detection_matlab_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/wuxexol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/ectomorph_workout.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/anemia_carencial.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/28023898131.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_off0000792e.bin
8af3dca96720e0140887541aed8fa8534c83f6288adddfdbca48a9f31bfe025c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792E 5228 bytes
font_01_sfnt_off00008b05.bin
c002ab9b481e769ea9a58d301532242ba1ed30488481269893c0e6cef71bf102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B05 11172 bytes

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