Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8f5cd0b6078c9a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 18:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda44f42dd8faa466cb5411d6bbd4cd1 SHA-1: a02af5e23e801c3bcf042d171642ce0c2c90bec9 SHA-256: 8a8f5cd0b6078c9a69de14fa83d01da304aed68262f966fb4228e01195d818de
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body text is largely garbled, but the presence of the URL within it suggests it's part of the lure. The primary attack pattern involves directing users to malicious infrastructure through these links.

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.com/wix?keyword=ok+ko+pow+card
    • https://static.usrfiles.com/ugd/a86d68_5882fb6d33e24522ad69eb0a355d40e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6fa439f4e394b0aa4670b60ef0a13cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff27de603d9f4ea992adab937c5f82db.pdf
    • https://static.usrfiles.com/ugd/b8c837_f139695ee2484889a870e9f9d6725a17.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_9282e1e3ae93422891bc271f6056e552.pdf
    • https://static.usrfiles.com/ugd/b8c837_11cf90d9264a4d69bbb1320605358a50.pdf
    • https://static.usrfiles.com/ugd/b8c837_15da4e260a7745cea480e065b662638a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f19f3f709c24505b265ac7d5dbada1b.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_6603ef0782ca425abe5af0ab0030a0bb.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3293/files/dazojusigugede.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/vawobexuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/xabiv.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_off00006190.bin
e2ae9c0d5c31217f59100aef7626e77720ca2fcb5655a3a5c3e423e975d52839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6190 5040 bytes
font_01_sfnt_off000072d3.bin
fdddccf8bb45671b49617c8c178dbae401f2acc3bb68d902da0300182ba78b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 10008 bytes

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