Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df382e1c264de0d…

MALICIOUS

PDF

48.9 KB Created: 2020-08-29 23:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ecb99fba2300f31333b375e374e526 SHA-1: a370b92bc1c12143fe0136ce027d48e524b05e19 SHA-256: 9df382e1c264de0d8aaf028151a1b5e8660697dbb93874a17f49f8875a485ca8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1200 Hardware Add-in Systems

The PDF file was identified as malicious by an ML classifier and contains a large number of embedded external links, characteristic of a link farm. One of these links, https://ttraff.cc/wix?keyword=sicario+script+pdf, is known to point to malicious redirector infrastructure. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect the user to 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.cc/wix?keyword=sicario+script+pdf
    • https://static.usrfiles.com/ugd/83e24f_d6d817ad6a364d4d9e96d5f4b5960559.pdf
    • https://static.usrfiles.com/ugd/b8c837_e07d4dac6c58470da4d7a93ed202c461.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a52eb78221f4fe49f00f493dab48e00.pdf
    • https://static.usrfiles.com/ugd/b8c837_30b71bfa4478426f97c1c0f33ffa93be.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bec7bd20ef2441ba72da88219e6da27.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/three_kingdoms_tv_series.pdf
    • https://cdn.shopify.com/s/files/1/0431/3494/3388/files/chaos_horntail_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/70487037562.pdf
    • https://cdn.shopify.com/s/files/1/0434/9306/4870/files/10836365295.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/31166976085.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/mizavobukatakabufep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7181/5331/files/tumulamok.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/78720647402.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/manual_of_montana_vascular_plants.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_off00008036.bin
6ec20e1375d12f0312dd8761a008b60381d71bbb8cb187b0e280c530601c7bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8036 5220 bytes
font_01_sfnt_off000091f9.bin
444db7a54fb2ccd0c3d481b4438e7da9e754a47b76b7df1a2c5d1b577ad9e96f
pdf-font-stream PDF embedded font (sfnt) at offset 0x91F9 11024 bytes