Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecb4c0965278bbf…

MALICIOUS

PDF

64.5 KB Created: 2020-11-24 04:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4f675b8caa4351ad96b2e17bcea60041 SHA-1: 10e1e1899a94628872ca92f6b7da04a34ca8f6fd SHA-256: 1ecb4c0965278bbfd6f5ddc792ed65b618cf9fbdec0d1c9dfc1d0c7656ae73fe
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links, constituting a link farm. One of these links, 'https://gettraff.ru/123?utm_term=apk+pokemon+free+download+youtube', is identified as a malicious redirector. The presence of numerous external links and the malicious redirector suggest an attempt to lure users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gettraff.ru/123?utm_term=apk+pokemon+free+download+youtube In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5f880ab9e4780.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdfIn PDF document text
    • https://ribuborufexegax.weebly.com/uploads/1/3/4/5/134507127/wugitopume_kezadupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8a8401afb0e.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/sipovaxa.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/dudorexu-wolexoriga-sizirigenesima.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/f9d3a7b849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_5f9c1ff1d08b6.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/6068010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f872fb880912.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/laradusa/short_emotional_intelligence_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2184adc6-6441-4d46-a936-fa0961a85395/godez.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/douglas_the_cuddle_toy_cat.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/59552688194.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_off0000bc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 5396 bytes
SHA-256: 57e5177feff38851e823c55320a4109b33b10a73c27333b9d6f461d300199e31
font_01_sfnt_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 11072 bytes
SHA-256: 4360fd4aab1c855cb4004837ac65be59c825d7d8d16331c45ccaab5734231a2b

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