Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae650522833a6d36…

MALICIOUS

PDF

74.6 KB Created: 2020-11-06 22:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d94ac4cae2b417fc5f3cffb4c745fcb9 SHA-1: 95e0bf3094e98b40a29a891fa7b8aea032df01b4 SHA-256: ae650522833a6d361e24360025900c7ac9cfd2b75936616264c3a3a20cc61474
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the URL that triggered the malicious redirector heuristic, suggesting an attempt to direct users to potentially harmful content. No scripts were extracted, but the presence of embedded links points to a social engineering attack.

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://ggtraff.ru/123?keyword=laputa+castle+in+the+sky+free+online
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f8ef9db351e2.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5f9e50cee7c46.pdf
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5f9d3731c1406.pdf
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fa50c25c812e.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fa41f5ec9709.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pifakimep.files.wordpress.com/2020/11/fododuxuxinoni.pdf
    • https://s3.amazonaws.com/wemupajese/algerieinfo_tlcharger_les_journaux_algriens_en.pdf
    • https://uploads.strikinglycdn.com/files/2dd32d1a-3e21-451b-8676-33f4c02fd229/balanced_and_unbalanced_forces_works.pdf
    • https://zikivep.files.wordpress.com/2020/11/sapimovezekisoka.pdf
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdf
    • https://uploads.strikinglycdn.com/files/8096b54c-8c57-4303-a767-fbe10e44bffd/commonlit_answer_key.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098e1.bin
f53a199e6bdc9f149e77d611310aa6b74906a73b09f1288313319acb239459d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x98E1 19972 bytes
font_01_sfnt_off0000d813.bin
957343c99da7e33daa280846122b3ee22b3e101ef7e4aff07fc7a54a76f6f6b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 5212 bytes
font_02_sfnt_off0000e9d2.bin
f03a58372f6be6050b18d72eeaefd28500da96cb86a8cbc3669768e962ad7f50
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 17268 bytes