Malicious PDF — malware analysis report

Static analysis result for SHA-256 76414e33d37d2e4e…

MALICIOUS

PDF

43.2 KB Created: 2020-08-22 17:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07916227010e67415be402cac7feab98 SHA-1: 960262a2442fc7a23c7f74083d1932f976c2b85e SHA-256: 76414e33d37d2e4ebc961763b7bfe724be83e928d91cef395aee093346ba342b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files. One of these links directs to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body is heavily obfuscated, but the link farm and malicious redirector are strong indicators of malicious intent.

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=csk+vs+rr+match+pitch+report
    • http://veneje.agingnaked.com/uploads/1/3/2/7/132740424/gitiw.pdf
    • http://files.allisonmondel.com/uploads/1/3/2/3/132303151/8204210.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/cannon_fodder_free_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0466/2309/6997/files/love_feeling_video_songs_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/request_letter_for_job.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0469/files/73929567005.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/wajijib.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/bolovugidugiva.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/indesign_template_freepik.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/kitolopotenozuwalavave.pdf
    • https://cdn.shopify.com/s/files/1/0449/5792/5544/files/english_text_to_practice_reading.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_off00005f0a.bin
4552eb9933d64723612ba135250823d8f53156b1ac4707ec2e1ef4bae1b8e76f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0A 4972 bytes
font_01_sfnt_off00006ff2.bin
b232c97578d049e962928914fea3ba9590d5b53b240a645a62662c5cc865f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF2 9972 bytes
font_02_sfnt_off00009232.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9232 4324 bytes