Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f488e20e7e02f1…

MALICIOUS

PDF

51.7 KB Created: 2020-08-18 17:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a473d7edb2a6415adbf69c4162905878 SHA-1: 3cc3e6fb3fa6833259eb105af959eb86b88c3156 SHA-256: d6f488e20e7e02f1f57c3ca59d8c73cbdb33e8c94ae4472d644316f2c0550304
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a PDF link farm. One of these links points to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a typical user-facing document but rather a tool for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=atalayas+antiguas+en+pdf
    • http://files.texascenterforregionalstudies.net/uploads/1/3/1/8/131856381/29afc.pdf
    • http://munoxamak.getbentzfarm.com/uploads/1/3/1/4/131436978/2052274.pdf
    • http://pifot.mystiquedogkennels.com/uploads/1/3/1/3/131380500/lonapusakefobok-kinepepodulawun-sexen-sikapokuwaz.pdf
    • http://files.erikharmens.com/uploads/1/3/1/4/131407144/5631300.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/kidetamazoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/4455/9258/files/zoology_miller_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/ukulele_chord_chart_with_finger_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/86599661904.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/14141093209.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8410/files/catch_platform_osha.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/57928345502.pdf
    • https://cdn.shopify.com/s/files/1/0428/3400/2086/files/wexavatujonedu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7236/3432/files/aviva_healthier_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/61878607774.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6295/files/nier_automata_dented_socket.pdf
    • https://cdn.shopify.com/s/files/1/0441/0540/0472/files/siludejomas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e09.bin
d922dd58dd6f0c6d9eccbe9f4669e5fabbaade82100fa3dfa7241790d19456aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E09 4976 bytes
font_01_sfnt_off00008f11.bin
8ac036d341f452efa8a78f040b22d37f5e59feed82f2e0bb67917c62e9c7a109
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F11 11356 bytes
font_02_sfnt_off0000b402.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 4324 bytes