Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7f8ace643c2816…

MALICIOUS

PDF

73.2 KB Created: 2020-11-18 04:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb8000b13427282cfb66283a75a5f28 SHA-1: d411081d8797a6aa9cc8f5fb24a62390b9a9737b SHA-256: ca7f8ace643c281671aaba052bf96ccbad9ef29560b7596d5129b1bc620262a9
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary malicious URL identified is traffmen.ru, which is likely used to funnel victims to further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/123?utm_term=ducane+gas+grill+parts
    • https://cdn-cms.f-static.net/uploads/4447093/normal_5faf9e42ef7b2.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/467057f3294d.pdf
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5f989231d37bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/c470da65-d3c3-4d07-a0a2-9fd48de7052c/76598067453.pdf
    • https://uploads.strikinglycdn.com/files/9a0273f5-612b-4f97-8222-84bff938e902/tm_gi_qua_m__ninh_thun.pdf
    • https://uploads.strikinglycdn.com/files/03fd4cb3-3136-42f6-b4c8-1c6ee3af23f6/rabuwigiwano.pdf
    • https://uploads.strikinglycdn.com/files/c59fca89-5eea-47d2-9616-9132541d2cab/23595564845.pdf
    • https://s3.amazonaws.com/xokebore/essential_oil_storage_case.pdf
    • https://uploads.strikinglycdn.com/files/678a2608-2172-4f67-9637-02d18639fbde/vepibaxenobovakegexus.pdf
    • https://s3.amazonaws.com/tetazino/bududamipawepazo.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2db.bin
11d2ca71a7949254e51b80bc51477109ba6a251108e909024d17309188225965
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 5100 bytes
font_01_sfnt_off0000d442.bin
fed1a6582c2a2863be3c399327ff66b06fd343f31a2a0250b575e60fe0dd5ca8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 9944 bytes
font_02_sfnt_off0000f070.bin
80f45486c0c63e2aa9143653ee4cfcb311155f0100e388604d7663c8b9ea56a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 11184 bytes