Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cee5bb8b664166…

MALICIOUS

PDF

75.9 KB Created: 2020-12-24 17:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd18e176e7ee6826130a8fec2903ccae SHA-1: 0ac626d6cd439d61bff2b4e65a6d3a095a7e81df SHA-256: a1cee5bb8b6641667daae034240540006e3d35f6ba78470c069bcdca93576ca9
272 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs that redirect to external sites. The primary malicious URL identified is 'https://cctraff.ru/strik?utm_term=mx+player+pro+apk+download+uptodown', which is likely used to distribute malware or conduct phishing. The document's structure and the presence of many similar links on disposable hosting suggest a coordinated effort to lure users to malicious content, potentially disguised as software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=mx+player+pro+apk+download+uptodown In PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/kebiso.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/fufatuseroxumiw.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/1ec20559d.pdfIn PDF document text
    • https://walasopi.weebly.com/uploads/1/3/4/5/134588780/duzepigomofubuk.pdfIn PDF document text
    • https://tajedapen.weebly.com/uploads/1/3/4/3/134373213/48527.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/e31b0fe16429a0.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/9815408.pdfIn PDF document text
    • https://dibodowe.weebly.com/uploads/1/3/4/6/134686502/23e6e12.pdfIn PDF document text
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/774c982a6c.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/246328.pdfIn PDF document text
    • https://kadefetu.weebly.com/uploads/1/3/4/4/134471860/zijojefewomemi_pepesu.pdfIn PDF document text
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/80d95bd8a098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_5fbb889346d4c.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xoval-nuvokesav-nidesebufiveja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5104 bytes
SHA-256: 9c9ff0dd6ebb207359b5b10eea2173f519d6b83cd57527eec352e6763f7a2613
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 11284 bytes
SHA-256: 353509005068dc3c82d197f03b37c0293dd442ea265382db75cf2791c2bacc74