Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3731fab51b2f9ab…

MALICIOUS

PDF

32.6 KB Created: 2020-08-29 15:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e6dadbeee23ccf7f27f466c33859b89 SHA-1: 8b0f7f159bafd5cf4d441ee947d25866d86366ec SHA-256: b3731fab51b2f9abd590959d758496e18795a1bc398c4d8167f2f7ab2d3d4eee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=blackstone+tailgater+manual'. Another critical heuristic identified a PDF link farm, suggesting a broad distribution effort. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links and the link farm heuristic indicate a likely 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.ru/wix?keyword=blackstone+tailgater+manual
    • https://static.usrfiles.com/ugd/cc10e7_1b3f03841dbc4315827132563bc46303.pdf
    • https://static.usrfiles.com/ugd/b8c837_6010536cacfd48e2856232d05af34177.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834814971b8414ca577aa28b115deb1.pdf
    • https://static.usrfiles.com/ugd/dd4472_02d568e478344f9a935ae4b219874b14.pdf
    • https://cdn.shopify.com/s/files/1/0430/6246/0577/files/saxugubajigerefuwojolewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8070/files/free_yahoo_messenger_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7392/files/film_storyboard_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/fidejev.pdf
    • https://cdn.shopify.com/s/files/1/0437/2378/4360/files/orthographe_d_usage_et_grammaticale.pdf
    • https://static.usrfiles.com/ugd/b8c837_827273defede44d1b6180b8bfe373ef4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7474e173042e48d09a9aaf84ad0c5dcb.pdf
    • https://static.usrfiles.com/ugd/e42ee3_2af66353cdc0419eb017651dfd336454.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9023c3dfb24611a4b12272a3f8156f.pdf
    • https://static.usrfiles.com/ugd/b8c837_643fd96829174a5bada6054e7027b46e.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_off00004289.bin
42bcae7b4717602e1115c562a2f40e3d74b9d941f3075865ef73a9a7cda4046c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4289 5232 bytes
font_01_sfnt_off0000543d.bin
13c1b6f6af7ef6583bc97a43d49a36eca8e51970790ad40fb7f834d53151056d
pdf-font-stream PDF embedded font (sfnt) at offset 0x543D 9916 bytes