Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c50e27c919ba363…

MALICIOUS

PDF

68.0 KB Created: 2020-12-20 02:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 10c3020210e2a988fc93e5170c65b693 SHA-1: db821a99637beedd799ed9d697667b8908022b10 SHA-256: 4c50e27c919ba363a295dd047ba51b2cab80761d59fc8555dabd1bdd558306c8
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. One of the primary links directs to 'traffmen.ru', a known malicious domain. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a date, suggesting it might be a generated document used for SEO spam or phishing. The presence of multiple external links and the detection of malicious redirector infrastructure strongly suggest an attempt to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=xbox+360+profile+icons In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5f937e4d3c9e9.pdfIn PDF document text
    • https://xowazusutimu.weebly.com/uploads/1/3/4/8/134880561/xexitax.pdfIn PDF document text
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/1419965.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/4694552.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/4757370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43eb5f0-5c33-4777-a134-a5a298e12fe7/77340934844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bcdc65a-9ee1-460b-89b7-568d7c48990d/fujomuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50daf9b2-8c4a-43fd-ae0f-176552a3fe29/xesip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d92e25-694b-43b9-8db0-2fcfd3d80274/kolebabexezegajafugoxezuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9705ea5c-a328-42d9-92a1-c4d12ea326ab/jimamugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0563e265-1fe7-4f97-8cab-83c467176554/32593162514.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b71bf140fc3aa58b6189/t/5fcf448505f6f27807563dea/1607419013973/15198158856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc98a23-43bb-44fe-92f1-2935f59c75e0/1947829763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a6d6ec-910e-4039-8259-f54f877cce23/tuzupas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c800e0-93f4-4272-ba94-457d7fe5f276/fofitaruve.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 5444 bytes
SHA-256: 58dccd4c1f9d79f7fd40d52ccfefa0fe6b14d391406afb7fe803d58ed825ae42
font_01_sfnt_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 10760 bytes
SHA-256: 05fac85fdace76177509753a93db94952a8368d90b336bca292e47fea2ed09ba

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