Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1c942468777ef2…

MALICIOUS

PDF

63.2 KB Created: 2021-01-06 07:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ad967c75bc1991e4b27e7d86271057 SHA-1: e8a586e62385859621bdd58e93d1758f1d4892f2 SHA-256: aa1c942468777ef202f635924d7968e57fb9ed856057262898a925ce1aa64168
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it is a redirector and a link farm. The embedded URLs, such as 'https://cctraff.ru/aws?utm_term=lkt+alaye+mi', point to known malicious infrastructure, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=lkt+alaye+mi
    • https://gikapizuwixa.weebly.com/uploads/1/3/4/0/134097763/dabemobu-sujot.pdf
    • https://kumufovuteli.weebly.com/uploads/1/3/4/6/134607328/9495096.pdf
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/memumen.pdf
    • https://nagafijobe.weebly.com/uploads/1/3/4/6/134621550/lufewadanagurawu.pdf
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/c2f39412c94.pdf
    • https://sanawovixib.weebly.com/uploads/1/3/4/6/134653903/3312036.pdf
    • https://mupawume.weebly.com/uploads/1/3/4/3/134365579/mimunitawi.pdf
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/ea6c81605eb852.pdf
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/2006625.pdf
    • https://cdn-cms.f-static.net/uploads/4495854/normal_5fe91de78d085.pdf
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5fde819a6a34b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/debamijizozexo/sin_city_2_cast_members.pdf
    • https://s3.amazonaws.com/wilugugo/puwesuzakuputerejevejulun.pdf
    • https://s3.amazonaws.com/zukogi/entertainment_reporter_jobs_los_angeles.pdf
    • https://s3.amazonaws.com/puretulenuza/cute_love_whatsapp_status_video_free.pdf
    • https://s3.amazonaws.com/banula/goxexetutubojud.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc18.bin
3859896a346e0b0d5eea664c4775156ded515568c09837ae6e86cc1ef8ced37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 4664 bytes
font_01_sfnt_off0000cbf3.bin
750c529ca468c2e82ed83e1227d289ccd806375064631978091294c5b424e2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 10668 bytes

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