Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7d9441ebb673de…

MALICIOUS

PDF

73.4 KB Created: 2021-01-13 16:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 01fc0b073110e12656993c08b9662036 SHA-1: 9177c12b64c72e4a5fd0f47bd216181676ac611a SHA-256: 3d7d9441ebb673de621180cfef2d37ae9ccf77c9015086996bf3c4280b3c558e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded links pointing to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=binoculars+for+astronomy+buying+guide`. The document body is heavily obfuscated and appears to be a lure, likely intended to redirect users to a malicious site for further exploitation or phishing. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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=binoculars+for+astronomy+buying+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f879e09691a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5fe102d9b4d3e.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/VogjWFm/34465587998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476273/normal_5ff4722562f63.pdfIn PDF document text
    • https://site-1204780.mozfiles.com/files/1204780/vorarigikuxekaz.pdfIn PDF document text
    • https://site-1172565.mozfiles.com/files/1172565/parachute_home_linen_sheets_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_5fd8df9696846.pdfIn PDF document text
    • https://lesavudipuvu.weebly.com/uploads/1/3/4/3/134338744/doxuvil.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/M2gj6ih/6504669102.pdfIn PDF document text
    • https://site-1172834.mozfiles.com/files/1172834/puxitotudovuwakevixo.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/xapidajovaji/xabimarigaradefamimo.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/nusodasikudulanewamikugew.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5632 bytes
SHA-256: be77fbc54211f12c63d06899add717d1c1aca1fb212cf31712feb3fff3d398a4
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 10456 bytes
SHA-256: 7b89eb8bd89faf9a0b682ef1d5473793df2fcbc666eaa57bf9c362552dd6233e

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