Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbb11550de3c2ea…

MALICIOUS

PDF

38.3 KB Created: 2020-08-30 08:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3af87ab31c388b43fc96677cf018d800 SHA-1: 01fefedadc55f3ad5aa3e8a36f43bbea50de032e SHA-256: 8dbb11550de3c2ead03d11d31b0a4698c06c058a5ec5c5434a23c296c70f3364
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector. This suggests the primary purpose is to redirect the user to a malicious site, likely for further exploitation or phishing.

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/wix?keyword=distribucion+de+bernoulli+problemas+resueltos
    • https://static.usrfiles.com/ugd/238140_4adea554daca4d85a55420562febecb5.pdf
    • https://static.usrfiles.com/ugd/3e87bf_0f1113a84f8e48ea831dda35874f881c.pdf
    • https://static.usrfiles.com/ugd/12f4eb_ed4d7250273141238e2cff63a6417a5b.pdf
    • https://static.usrfiles.com/ugd/5ed537_4930178779084d7cae7b3d0bbff0f36c.pdf
    • https://static.usrfiles.com/ugd/b8c837_564a652eb83b4f5a923aa5e0bee86d9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34944ebd7a840a1aca28e821e20bf63.pdf
    • https://static.usrfiles.com/ugd/e8506d_07411835d2134a83a327be76ff3a6a8e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/abbyy_transformer_3._0_pro_cena.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0434/0832/6812/files/10873462996.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/38192342172.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/fake_text_message_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/91631693097.pdf
    • https://cdn.shopify.com/s/files/1/0444/0725/9302/files/dibujo_tecnico_para_arquitectura.pdf
    • https://cdn.shopify.com/s/files/1/0437/5176/8225/files/bivitimujanugo.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_off000051dd.bin
6001d04a426570968616d9220de0ca47ffad3e23f87383981d05b3afc96419f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51DD 5356 bytes
font_01_sfnt_off000063eb.bin
06af613fccd143b00c9e61675b0c0cfe5f9070eeec0fec82a6161b7962b6619d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 11888 bytes

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