Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef5bda1bcf0212a…

MALICIOUS

PDF

48.4 KB Created: 2020-08-18 18:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e862f28b2692bf1b0a60e7d14b72ad2d SHA-1: e86bd33d07bdb56aa17e9ca7cf262138d5fde077 SHA-256: fef5bda1bcf0212a63a71e1863f6b7a0ba81fd3ed549343a320e36d7ead83096
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to a popular game. The document body, though heavily obfuscated, contains the same malicious URL and several other PDF links, suggesting a link farm or redirection strategy. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=pokemon+let%2527+s+go+pikachu+game++link
    • http://pitipinaw.golub.family/uploads/1/3/2/6/132681399/balezefitimit.pdf
    • http://files.rosebayridge.com/uploads/1/3/0/8/130874329/2924164.pdf
    • http://files.bnsathletics.ca/uploads/1/3/1/1/131164081/ralororij_sileloxaxuzi_vivovewelovav.pdf
    • https://cdn.shopify.com/s/files/1/0447/2002/9852/files/84175349307.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/financial_management_budgeting.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0714/files/22523309813.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/gebigod.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/46354238491.pdf
    • https://cdn.shopify.com/s/files/1/0439/5496/2590/files/pozedilivunuzudifetuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2121/3591/files/28479623389.pdf
    • https://cdn.shopify.com/s/files/1/0433/3794/1160/files/descargar_biblia_de_estudio_thompson_reina_valera_1960_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/25483217013.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a9e.bin
e457c9383f9af87da8781c44659832dff5924f300f941d8499e3735e1406aa0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9E 5232 bytes
font_01_sfnt_off00006c4a.bin
3c215432847e3bdc6dce50afaf0c6180da554537743a197e1c26ba61fb744eb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4A 10588 bytes
font_02_sfnt_off00009077.bin
e7689d70152ecb8893edec0947388512f8ae4b5fc274e7f9282587fc72bd6d6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9077 16336 bytes
font_03_sfnt_off0000a65d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xA65D 4324 bytes