Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94a745546ff9523…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 23:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6e86309535923e8abd71c19d5e0942f SHA-1: 802480b4850c33d814edd02da8b15687d9978171 SHA-256: f94a745546ff95235e41956b6518996f8b19a86c1634c8d03757d3e40bf5f6ef
152 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.com, which is disguised with keywords related to flight simulators. The document also hosts a large number of external PDF links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, but the presence of a malicious redirector and the link farm strongly indicate a phishing or malware distribution attempt.

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/pify?keyword=flight+simulator+game++pc
    • https://static.usrfiles.com/ugd/b8c837_21a128bb8abd428692a50df8c46191c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_72d799f7de07494d9d8d6d4f0dc5e40b.pdf
    • https://static.usrfiles.com/ugd/d5cf39_ff2927d3b26c40c2a8ce1b8200e5702c.pdf
    • https://static.usrfiles.com/ugd/067ecb_e8a80f90d14a48c78cbbf0b5294898dc.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_7e0cb5b3639647359a77d9ee836020c4.pdf
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/37202087857.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/15337168078.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdf
    • https://static.usrfiles.com/ugd/63d3ad_78813b936aa74b0cbb851d0947c192a5.pdf
    • https://static.usrfiles.com/ugd/fac845_9d0e76c639ff42ea863e8eca879db748.pdf
    • https://static.usrfiles.com/ugd/eaf48f_f5b8ed165ac74f7e8bb85de222d80906.pdf
    • https://static.usrfiles.com/ugd/c1de29_9e6c5b1158bc4c8e839e292ec2318a45.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/62671043795.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/kanutozojetalaref.pdf
    • https://cdn.shopify.com/s/files/1/0433/5891/2662/files/hydrothermal_synthesis_of_nanoparticles.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_off00006a32.bin
2a30af4d722b49cdeb1087ad492e7f8f58194b54dcb11dc03bf8fbf0c2241ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 5300 bytes
font_01_sfnt_off00007c10.bin
e380f845f8ac27846b7e0e9a32aef96099a321bf3eea568f3d78110cfeab3c88
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C10 12144 bytes