Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e3aac2170bc4fd…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 04:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2457f3992245f7d8050027b22330862b SHA-1: becfaf70c291ee22e5acb61a67ac7e8ed8e12266 SHA-256: 38e3aac2170bc4fd9e602bfd4e057ad1fe7313b05f7efda7cba2ecda0876cb7d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is used to lure users into downloading potentially unwanted software. The document body, though heavily obfuscated, contains the same URL and keywords related to game downloads, suggesting a social engineering tactic. The presence of numerous external links, many pointing to static.usrfiles.com, indicates a link farm designed to improve search engine ranking for the malicious content.

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=empire+earth+3+download+full+game+fr
    • https://static.usrfiles.com/ugd/599f1c_210befb2cc884978ba30aa2aba44e1b7.pdf
    • https://static.usrfiles.com/ugd/628a76_53a066e719594927b3bb8b604e9a8615.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8d04b7286c74c4d9313019fa351465c.pdf
    • https://cdn.shopify.com/s/files/1/0431/1118/6588/files/20853707221.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/android_10_fr_nokia_7_plus.pdf
    • https://cdn.shopify.com/s/files/1/0440/4481/2438/files/96145474486.pdf
    • https://static.usrfiles.com/ugd/91e123_4af9e34aa2af41259d4211345a07ed74.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eb0e77a0ce34d7fbf99dfe246adae0b.pdf
    • https://static.usrfiles.com/ugd/8cbfce_a06052f29b7f4486b29a7c82489218f8.pdf
    • https://static.usrfiles.com/ugd/39cb9d_9f964f6ab676422c9ce2f7802492dd1a.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_409e3fc3173b4ed88553a8c921b77af0.pdf
    • https://static.usrfiles.com/ugd/0c268c_6c48aa0d3af14bd9b7a28ca7fef51221.pdf
    • https://static.usrfiles.com/ugd/e745be_00078b9018954d27816393991de8d50f.pdf
    • https://static.usrfiles.com/ugd/bb13a2_fb056111fcc547f89bf8dc1b27a19418.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_off00006a76.bin
d278158477902123f95d64d34961be96b7964362de916479f3b8358dcfcfe485
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A76 5488 bytes
font_01_sfnt_off00007d13.bin
305043adcaceb384d7b27e229a2ce57a99dd89d39aaa55ecfaef881b368396b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D13 10324 bytes