Malicious PDF — malware analysis report

Static analysis result for SHA-256 51383cdaa7c6ffc9…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 16:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9e8f73666ca0037efe75923324fe52d SHA-1: fb975879e59bed7f57257b36839812a195aa56c5 SHA-256: 51383cdaa7c6ffc9d2518e2001b55d9285827247e25609f253800f540ebdbe5c
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous external links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), suggesting a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector indicate a high likelihood of user-directed compromise.

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/pify?keyword=sonic+sega+all+stars+racing+transformed+wiki
    • http://beraxif.villageparlordetroit.com/uploads/1/3/1/1/131164250/8755079.pdf
    • http://menoxonav.mcredwinter.com/uploads/1/3/0/7/130738854/30c12e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/bukevomolusix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/11617449432.pdf
    • https://cdn.shopify.com/s/files/1/0433/9826/7029/files/osu_cookiezi_skins.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/mafutanaso.pdf
    • http://files.alinken.people.ua.edu/uploads/1/3/0/7/130739678/f467322b73a.pdf
    • https://cdn.shopify.com/s/files/1/0450/0068/7780/files/beata_pawlikowska_jzyk_angielski.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/1128074448.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7615/files/zezenawutasifafagezumaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/79269190201.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/39074950528.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/meeting_minutes_sample_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/lobugilerubukatonap.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_off000052e8.bin
26e3bfbd15d917381759d27f9c34fd673a72ab6fb6c3a66aff40a2dc1eef35d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x52E8 5600 bytes
font_01_sfnt_off000065e5.bin
f0fa3f7234465a2a28ca25a094713df1e4cd9ceda4eba9f2e96233851c3a1678
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 12908 bytes