Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14adf292e7ab72d…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 21:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1409aa5fd6e65ac6b4439a39b4348b7f SHA-1: 3392d19a759293d57808cd2462b2449bf8b7917c SHA-256: f14adf292e7ab72d39ab56e2aec8d986a78f02b0dacf09b8e56dcef40e9487da
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. The presence of numerous external PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO poisoning tactic to distribute the malicious link. No scripts were extracted, and the primary malicious indicator is the embedded redirector 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=benefits+of+computerized+accounting+information+systems
    • https://static.usrfiles.com/ugd/b8c837_1c40d98904134ebeb83011c833cda62f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e91a634fb4d42afa64c2b9967012a9c.pdf
    • https://static.usrfiles.com/ugd/921909_b114b607b88d495fbc2c8d0ec3271129.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/warhammer_40k_khorne_daemonkin_codex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9201/files/call_aundi_full_hd_video_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/jeropimenamovaxatapudugov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67257536452.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/zagobalilozaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3272/files/59056730600.pdf
    • https://static.usrfiles.com/ugd/03ae60_db2642f0a73f48989abedab7e8aced8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34944ebd7a840a1aca28e821e20bf63.pdf
    • https://static.usrfiles.com/ugd/d94ae5_444cced8d538474d9b4e17d23c1ad97c.pdf
    • https://static.usrfiles.com/ugd/c0fca2_08c534ee942548578ffeaef5ef075485.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_a9a774c9a44a43cda0b6d0e2ba4689e4.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_off00006838.bin
acc85bf51681cda1b8d1db85df7d94645900707fd9586ea84b8f60910af8c685
pdf-font-stream PDF embedded font (sfnt) at offset 0x6838 5644 bytes
font_01_sfnt_off00007b70.bin
4c5ef61b3d24e8129c67bfeff5a87545037941fbb38067238caf73416375fff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 9844 bytes