Malicious PDF — malware analysis report

Static analysis result for SHA-256 588f786d57f689bf…

MALICIOUS

PDF

42.6 KB Created: 2020-09-04 23:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d63c6063ff241f0b16768b2a2b106eed SHA-1: 5cd5f6723fd054542226aab740849a0ea01f452b SHA-256: 588f786d57f689bf543c6aaf1b19aea13be673091d8426c3c21735cd6e88d462
152 Risk Score

Malware Insights

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

The PDF contains numerous links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary redirect URL, 'https://ttraff.club/pify?keyword=assassin%2527+s+creed+rebellion+mod+apk+free', is likely intended to deliver a malicious payload. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=assassin%2527+s+creed+rebellion+mod+apk+free
    • https://static.usrfiles.com/ugd/1d64af_c122a22f31fd44dab84095368a42ee56.pdf
    • https://static.usrfiles.com/ugd/599026_7802986491004d339744600be659cc04.pdf
    • https://static.usrfiles.com/ugd/e4f6f0_3eea64384a794199992cfa26a85f891f.pdf
    • https://static.usrfiles.com/ugd/0c41e7_b1cce17bffd548db8d8bc9c5037cf26b.pdf
    • https://static.usrfiles.com/ugd/de60da_b4d35b0debf74291b4ce26a5586e4408.pdf
    • https://static.usrfiles.com/ugd/38bf1f_efb54c7735d74a909490d8130fdf1b22.pdf
    • https://static.usrfiles.com/ugd/d162e3_5e6bccedd5b04cd4a5a16dfae02f1d3e.pdf
    • https://static.usrfiles.com/ugd/87d215_5cb078808ec545c49f9ba64de8c5cdff.pdf
    • https://static.usrfiles.com/ugd/739437_1ccca03492224e5aa109f84ba0765d6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4373865ff713443e9c4123674c41c7e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c45884a71143b18055d956689e6f83.pdf
    • https://static.usrfiles.com/ugd/b8c837_60c32697e40e47429aa316643a28fa53.pdf
    • https://static.usrfiles.com/ugd/b371d9_94fcedccb18d48f8a15584ead3c6bbe5.pdf
    • https://static.usrfiles.com/ugd/cd79e3_1cbaf5c968aa4af2bf223aae1de049bb.pdf
    • https://static.usrfiles.com/ugd/0b1cf2_cbeb6cd30e3f470a9b43d8c667a9c5a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d51f0409b5254051a863753429337874.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_off000066ba.bin
eed100b23c33fde08cc6c9ee107c1948a9b72418cbcf43daa828938ae35ed473
pdf-font-stream PDF embedded font (sfnt) at offset 0x66BA 5528 bytes
font_01_sfnt_off00007973.bin
62e2f313d940cb72e7c2e688bb389faa492e2ecfe991828f8ceec4d97465ecde
pdf-font-stream PDF embedded font (sfnt) at offset 0x7973 10720 bytes