Malicious PDF — malware analysis report

Static analysis result for SHA-256 220a1368fc5f6598…

MALICIOUS

PDF

43.4 KB Created: 2020-09-03 07:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f082c425a8e1c2b69f0971390c8e4fe SHA-1: 6778c3a8728a2453782060cae94539c82e4ff8b7 SHA-256: 220a1368fc5f6598db4aace2a99536595ae9fb61cf1c9ba1efbc80a4b44d2020
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=suara+burung+kakak+tua+putih'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is 'https://static.usrfiles.com/ugd/b8c837_e36fb5fe9e074d02bd5680be6ef6f5ae.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains these URLs, suggesting the primary intent is to lure the user to malicious infrastructure.

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.me/wix?keyword=suara+burung+kakak+tua+putih
    • https://static.usrfiles.com/ugd/b8c837_e36fb5fe9e074d02bd5680be6ef6f5ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_0594522118634434b89fcab4cf604644.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4b7d39b72a64b3a9ebd791606d268f6.pdf
    • https://static.usrfiles.com/ugd/b88e3d_10cf6c8d2a404beebb8a0357308e307c.pdf
    • https://static.usrfiles.com/ugd/516574_eaa43961f1fc428a83fdce58c0546893.pdf
    • https://static.usrfiles.com/ugd/b8c837_6225c5f438aa4b61b80c7da4c7ea05b4.pdf
    • https://static.usrfiles.com/ugd/45e30f_0469630ebe29484dab03d2b266a60a87.pdf
    • https://static.usrfiles.com/ugd/e2f197_281364e46a9441a1aba94d1bbe2cb1df.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe087dee0ac440b78ff6ddd6c68974aa.pdf
    • https://static.usrfiles.com/ugd/d13e1f_b4b6edc5b1824720ad43fa23b0332b6e.pdf
    • https://static.usrfiles.com/ugd/eed56f_47d243b587794275a04520d6d23f9d49.pdf
    • https://static.usrfiles.com/ugd/e2f197_e5f4ac221aa74214a3d99323a57a99dc.pdf
    • https://static.usrfiles.com/ugd/b09e1d_589ac83bdeb044efbee479a2650ddf7c.pdf
    • https://static.usrfiles.com/ugd/c722c2_cc8076c7117e4ae99fa974016a1256ec.pdf
    • https://static.usrfiles.com/ugd/e481ce_d0f2cf91b5b84149a3e2845e95b81d66.pdf
    • https://static.usrfiles.com/ugd/ab63e3_9e321893397d48fc913369f800c8be46.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_off00006319.bin
33c65039ac9fc526a72bb69be8783f0a32a65d96aedde6038efe1d843aac2846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 5176 bytes
font_01_sfnt_off000074b1.bin
6b29b739ced52b3700dc84f030a75ab6fbcc28c15b898337ab8e7e32a8399338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B1 14216 bytes

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