Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe91930ff475684f…

MALICIOUS

PDF

64.8 KB Created: 2020-09-06 22:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06850ad984206b3f78b54cf460fddd1 SHA-1: 60501497b138c6189f6f1a7a35c48c7de06cd387 SHA-256: fe91930ff475684fcc8de340d3a3a321c9b4af120949c3af996c3d47c1e1dc48
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised with a keyword related to image processing. This indicates a phishing or social engineering attempt to lure users to a malicious site. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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/wix?keyword=general+affine+transformation+in+image+processing
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/94525756436.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/mujubegetorobiwuloluj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/mefazesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1127/files/bunuzadufelige.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7582/files/xaradonenuzegajuvake.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/pagiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/python_standard_library.pdf
    • https://cdn.shopify.com/s/files/1/0457/7270/1862/files/48447226287.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3975/files/vigumet.pdf
    • https://static.usrfiles.com/ugd/b8c837_23aa52622ae04cd6862ec580406df94f.pdf
    • https://static.usrfiles.com/ugd/2ca09c_f4b3d8900ce743329c9ae66bf5fe344d.pdf
    • https://static.usrfiles.com/ugd/b8c837_847af44f1b3546cfb31964275fee38e1.pdf
    • https://static.usrfiles.com/ugd/3c2969_aeb14eaaccd94b07850abc5cb6a6dd13.pdf
    • https://static.usrfiles.com/ugd/008e52_a8db07a019bc43159ecec589d81dabb9.pdf
    • https://static.usrfiles.com/ugd/01f9b9_56eef075a9fa4dee8c7f0e72cb188358.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_off00009cf5.bin
a7453eb7a41d706320ff5d4024a749945fe73b2d4cc117d044e5b529f49ba49a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF5 5364 bytes
font_01_sfnt_off0000af26.bin
40d0165cfcdfb749bb17a52b5756fe939a79d17086d093fb2e52a55261039752
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF26 15092 bytes
font_02_sfnt_off0000deec.bin
e7b42e5f29e40091b5982f4c82d19047f56592b4171ea3f1ec4f07623dda1330
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16456 bytes