Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4d6db482544ac5…

MALICIOUS

PDF

68.0 KB Created: 2020-11-25 17:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5cf8c10030718141406130c5e193aa66 SHA-1: b83937a2a318593801f106e3e7c5fe75400584c9 SHA-256: 2a4d6db482544ac58fff0cb47654a3aece0db462410e719bd9417cfd1939ee21
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to traffmen.ru. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external links, with one example being s3.amazonaws.com/lokijuronig/42190648849.pdf. The ML classifier also strongly flagged the PDF as malicious. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://traffmen.ru/strik?utm_term=animations+in+google+slides+app In PDF document text
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/riwami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f92af885d545.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/5028379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fb83ca5202b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5f9b1a5f4dd1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5fad4a343f6a9.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/8fb5ffc491.pdfIn PDF document text
    • https://dosowaworizur.weebly.com/uploads/1/3/4/6/134688898/disojijofavexileto.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/lokijuronig/42190648849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71808a1a-1fc7-4a2a-bd68-b1d8a41a9fcd/39853219930.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/xoramipapagegeganedanoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3fb221-8754-4b02-a5f0-d2d949bef0f8/ganupisegesog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec45f44-ea58-4dd9-856d-dc35a1f3b754/fufusugiril.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/human_population_ecology.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/nitabegadidiwapuw.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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 5172 bytes
SHA-256: b4d1295660f35ff84c4c5f508d6d5faa6dc872cfab303a55ef586d347a44cfb2
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10216 bytes
SHA-256: 8f7fd443f45432ddbb6c81a23e3f7e43480b6eff5e16f9678e7f62c1502db925

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