Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca889f015f3bc2f…

MALICIOUS

PDF

71.1 KB Created: 2021-01-11 13:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d095397d75011c1b896b8efa92a552d SHA-1: 03022585b3bc40edd2a248d54e65f5971a229d40 SHA-256: 5ca889f015f3bc2f1ebdca0bdbd08f6e3c24fbe34a951d90be23b920c3a90fc7
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. It contains numerous links to external websites, including a critical link to `https://cctraff.ru/aws?utm_term=android+library+module+assets`, which is identified as a malicious redirector. The document body is heavily obfuscated and appears to contain junk data, suggesting the primary function is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=android+library+module+assets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_5fad9452704d9.pdfIn PDF document text
    • https://site-1173271.mozfiles.com/files/1173271/new_gangster_crime_hack_version_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_5fb86587c00ad.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/1945354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_5fd825db74201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f89b219850db.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/pudijevumumo.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/pamexefosebugajovuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f99057ce903b.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/5064291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f9127612c7e1.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/3243756.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/kufazete/72851898220.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/netflix_app_android_apk.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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 5204 bytes
SHA-256: 39c370c89a7b63f88b2af51a4d0fd357d65013e405b2b39e4f2bb982a4de967c
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 10664 bytes
SHA-256: e4535945e9c58226b55b1f1d77dda8e5d10f9c8b2a97b7ab91abeb61abb75003

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