Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a551f1407742861…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 04:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d476f856acefa54db4d0e06d0eebbe07 SHA-1: fa873caf26a47f500b5b97106d99b37c535e76f0 SHA-256: 4a551f140774286146fdde162e50ec544abc6606c5d120fe7db74a43eb7f6aa1
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to deliver further malicious content. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a game download. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or distribution network. No scripts were extracted, but the primary malicious behavior is the redirection to the malicious URL.

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.cc/wix?keyword=fishing+barents+sea+game+free
    • https://static.usrfiles.com/ugd/0b46e6_74d0b3e1911c40dd8580250a2bf743a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5890738ab8194d409fb46014ba53d5ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_e36b7e4a920346da937485d9921a63db.pdf
    • https://static.usrfiles.com/ugd/e3834b_f495842898a04e829afabd3aae34ed3c.pdf
    • https://static.usrfiles.com/ugd/e3325f_2767efec53cf40628f7ee266a0d23f5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d10fabd072346dda4cf7dba52b25347.pdf
    • https://static.usrfiles.com/ugd/906e9f_fc0e32354c9f44a087f4d4afb89139c2.pdf
    • https://static.usrfiles.com/ugd/de02f3_b5a140c712db4e21a5c91c56972d9b7c.pdf
    • https://static.usrfiles.com/ugd/eb4c03_d5b189739a51467fb15d54369ec53a3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0183fa233b04eaba1a5c57c03c6be3f.pdf
    • https://static.usrfiles.com/ugd/07625c_bea321cf64614d02af12af8d2640966a.pdf
    • https://static.usrfiles.com/ugd/5af86b_691ea8d38d964a298254fb60d132f409.pdf
    • https://static.usrfiles.com/ugd/e3325f_92af157a2387448e8035b3c6b89edd65.pdf
    • https://static.usrfiles.com/ugd/6cf392_16f8fb43f3764109a003ed435f07a415.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_85857122073e455a9c43f27c6076ead7.pdf
    • https://cdn.shopify.com/s/files/1/0461/8108/9434/files/arya_2_bgm_ringtones.pdf
    • https://cdn.shopify.com/s/files/1/0438/8428/2008/files/gupafakawozububuvuw.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_off00006599.bin
b223c0cd43e3355ffb89b017ce4a5b17c5c42f058245b88e4afbdcc2ec93baee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6599 5244 bytes
font_01_sfnt_off00007749.bin
fdda63616c05bceac5f36a24dc43c1254c79c3d6ac078bb9bea2bb47579ec3d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 11052 bytes

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