Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b9061a2b4a9967…

MALICIOUS

PDF

71.2 KB Created: 2020-12-02 07:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 57f700e5ab19243154d9b97675100f57 SHA-1: 9458ce14377a0d53eb9f4f40d6804ceca7149687 SHA-256: 37b9061a2b4a996721e5b05dd31824cc63b3c28e0cb24764aa2f4c076effbbdf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many of which point to other PDFs, suggesting a link farm or phishing campaign. The primary malicious URL identified is cctraff.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=for+honor+conqueror+guide+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f9742534577d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_5fb87f9fc66c4.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/2246694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5faa77b07e0e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fa4fef093066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_5fa203d2889bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_5fb256d780275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fb681d2b5a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5f973da546600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5fa693791c670.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ffabc819f1cf4d03d5f/1606377466207/61916105046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8467dac6-d597-432c-9589-f90dc9f547f3/24114348980.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6271f3de5e49b55c3fa2/1606378098428/nmh_remote_access.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/44115547852.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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 5384 bytes
SHA-256: 1b8318bbe662e314a7616baa9af5a48c261591c3376d12aed1976f37bc8efeb9
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 10164 bytes
SHA-256: 6b22d922cbaa56c4846c31167146cb5f1e6a3dd05cdb856ac7c12c3e07ee3937

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