Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3bc0bc040c672e…

MALICIOUS

PDF

61.0 KB Created: 2020-11-10 11:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cd0d8f542430c0eb1ccafc558505e305 SHA-1: e09dd334ef42334e09a1e7241a30d0ed1055cbb5 SHA-256: aa3bc0bc040c672ed44ccdfa3f18d283d16a23c3efbc5227fe5bd7b5c28e9030
244 Risk Score
Tags
free-cdn-ebook-manual-lure

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, including critical alerts for linking to known malicious redirector infrastructure and hosting a large number of external PDF links. The embedded links, such as 'https://gettraff.ru/strik?keyword=puffy+apple+pancake', suggest a phishing or link-farming attack designed to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself is weaponized to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?keyword=puffy+apple+pancake In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f90900b1283d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f9e300f48525.pdfIn PDF document text
    • https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/5031588.pdfIn PDF document text
    • https://nunebavakagepas.weebly.com/uploads/1/3/4/4/134446468/rikededutexem-vemus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f9618f546761.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/7481487.pdfIn PDF document text
    • https://vikuxujawud.weebly.com/uploads/1/3/4/5/134515409/866e07ad47b.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f9cbcbac1dd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_5fa3961c4850f.pdfIn PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/dojud-pafake-pezivok.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/xatojem/root_android_device_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932bc4dc-3883-4770-b164-9472d9e1d542/fovavunaxirapiwanujadib.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB458 4900 bytes
SHA-256: 1d0c82f74f1272e4345e71254bf7ababedd7de8ef76081025be0ac09ae276993
font_01_sfnt_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 10256 bytes
SHA-256: 3fe8128edafe423c5fb7afcbc6916257ee6291df37f51b46eb260831b6344b62

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