Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc581b4fbed5b1dc…

MALICIOUS

PDF

72.8 KB Created: 2020-12-15 07:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0606e564b4ea9c29916adc30b7354f95 SHA-1: 6803157e0ecb8e9f3373b6123e0255a43acbfe3d SHA-256: cc581b4fbed5b1dc4a7d7881142c86614704638e340ce43556d1c55ac898928d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL identified is https://cctraff.ru/strik. The presence of multiple PDF links suggests an attempt to manipulate search engine rankings or distribute additional malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=golden+gardens+beach+ballard
    • https://gejodaxavusaw.weebly.com/uploads/1/3/4/7/134708791/jepetib.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/fijijiweteredi.pdf
    • https://kukezedom.weebly.com/uploads/1/3/4/6/134629177/76683e54194d8ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfd2c9d7936484054a605/1606286639556/jajutaxamajubibexaroze.pdf
    • https://s3.amazonaws.com/sefiwegegagu/agent_vinod_full_movie_link.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1d39cb3e0f577117480d/1606294843150/27513290917.pdf
    • https://s3.amazonaws.com/medadele/eleven_by_sandra_cisneros_worksheet.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf50fde18c5c478ef27951/1606373629555/kijozuruku.pdf
    • https://static1.squarespace.com/static/5fcf68723d7784041093dffd/t/5fd6f50e0f11661d4c412065/1607922959975/gojujojuza.pdf
    • https://static1.squarespace.com/static/5fc5768fc6229360eccbb460/t/5fc8c6d46031f4738627ec51/1606993622297/fuzolevozukagonajalu.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf57409ee0f32b874ad1cc/1606375236337/60706757981.pdf
    • https://static1.squarespace.com/static/5fc0dde9d26ff1194f7385b9/t/5fc584df18e72e5fdb9463ec/1606780127852/best_stevia_brands_without_fillers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12a.bin
104bc2d125c83193f64dd59ed8117f80d7415861ee36ffa0140e267c19a0426c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 5032 bytes
font_01_sfnt_off0000e230.bin
e1fcdafd69197c37ed573643c03af077ca4373fe62f3a7134c36f59a0021c073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 11184 bytes
font_02_sfnt_off0001081d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 4324 bytes

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