Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1751419f722c678…

MALICIOUS

PDF

36.6 KB Created: 2020-08-29 02:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39e72b2f85975c7fcf2ce5fad8fb3ad SHA-1: 1532432c063581e39db4516e9fdd648d49b9a0d5 SHA-256: a1751419f722c678e64cc47e66d6bfebd965565723e4e0ea28d19154c25897f9
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing operations by overwhelming search engines with content and redirecting users to malicious sites.

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=bee+gees+holiday+piano+sheet
    • https://static.usrfiles.com/ugd/b8c837_a7eadc1caf0b4c1e95814b6296c2172f.pdf
    • https://static.usrfiles.com/ugd/b8c837_25ba539ba84e406a9d6b52004b1e64aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_aacdb2b4e93540f9b50dc859f16f846e.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/94799057600.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6933/files/luluvojozadukarijufuwomid.pdf
    • https://cdn.shopify.com/s/files/1/0436/8020/2905/files/free_abstract_reasoning_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/jenavovirox.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/66808205887.pdf
    • https://cdn.shopify.com/s/files/1/0471/0671/9894/files/9107544180.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/osteoporosis_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/strategic_partnership_policy_defence.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6630/files/74452912684.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/27669879339.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_off00004f0e.bin
c21f03d05097976304ea8520f8cfa9ca49090c661316a9ae68cfe4524279931d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0E 5276 bytes
font_01_sfnt_off00006104.bin
ffbb26faa5cae165295afca1dc2ce02922b9045492e5d1d966db11e9e3909a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 10912 bytes