Malicious PDF — malware analysis report

Static analysis result for SHA-256 958977fc8e23b24e…

MALICIOUS

PDF

49.5 KB Created: 2020-08-30 01:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b17c747a05e7f61f2d06a6189889f5ab SHA-1: 627829ae1d2ce251c1ef8eba840b205cae3d10c6 SHA-256: 958977fc8e23b24e5f351c024ce35007a3330ad687c1fda7cba72dafb14ddbdf
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded link points to 'ttraff.cc', a known malicious redirector. The document body, though heavily garbled, contains a reference to 'oldboy parents guide' and the malicious URL, suggesting a lure. The presence of numerous external PDF links further supports the link farm detection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=oldboy+parents+guide
    • https://static.usrfiles.com/ugd/b8c837_38c043821084448fb437f6f658a03275.pdf
    • https://static.usrfiles.com/ugd/09273f_a588cf455cdc47c5a0f9a11cb10e6669.pdf
    • https://static.usrfiles.com/ugd/b8c837_10e08f0e5c124c609bac4c9cf503a20d.pdf
    • https://static.usrfiles.com/ugd/a4e402_d18563a14a8846b3a0f59d47e275b269.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/alarm_lock_networx_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/69263016341.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0429/5006/6339/files/11455493038.pdf
    • https://cdn.shopify.com/s/files/1/0436/2423/5170/files/69578280498.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/15686320859.pdf
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/troy_bilt_pressure_washer_manual.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_off0000853d.bin
8f9c8d76d86fa635de33ce78c119abbe3955ce1471ff3a89856538f1d85366e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853D 5396 bytes
font_01_sfnt_off0000979d.bin
e9cfedbc826f6eaeeee29f92a66ac266cfa813505c4426f9ff00e505aa7ce402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979D 10084 bytes

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