Malicious PDF — malware analysis report

Static analysis result for SHA-256 656a1aacb70a6a4e…

MALICIOUS

PDF

61.2 KB Created: 2020-11-20 02:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8efd56b11b205e77f36679e5546b701b SHA-1: d851b62c5b3fdcd3c6a83cc453d33426e07709b6 SHA-256: 656a1aacb70a6a4ee418e13bec918421490622a44b849cd3e9f7cab7599718d3
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a link farm and a redirector. The document body, though heavily obfuscated, contains text related to a "millwright and mechanics guide", suggesting a phishing or scam lure. The presence of multiple external PDF links and a critical redirector link indicates a high likelihood of malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=audel+millwright+and+mechanics+guide
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.pdf
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f8829c9a7548.pdf
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f8f43eabccb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dobesogum/albumin_transfusion.pdf
    • https://s3.amazonaws.com/radubozufiwo/xovepejesaxulukuluxe.pdf
    • https://uploads.strikinglycdn.com/files/7c68831b-bdc7-4221-b925-5ce98c382c9d/28282377930.pdf
    • https://uploads.strikinglycdn.com/files/884795e0-6cd4-4a9f-9e0d-ad670245527a/nilipuvevexupibevuf.pdf
    • https://uploads.strikinglycdn.com/files/11b05203-a86b-4ec6-9365-dd87e9ba7413/1594188088.pdf
    • https://s3.amazonaws.com/patotale/zajotokorifonobopeg.pdf
    • https://uploads.strikinglycdn.com/files/3299a8d2-3d2f-4845-ae58-be9c1366e7d3/dvd_logiciel_en_des_flammes_dcharge.pdf
    • https://s3.amazonaws.com/wovitiku/unblocked_games_66_potty_racer.pdf
    • https://uploads.strikinglycdn.com/files/88abc265-0db8-44c8-918e-4fb726a98f30/linux_tutorial_tutorialspoint.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4be.bin
66cd4ab929358a74e86eebdbf16b913a571813e5d610fc9635134b683b3075dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 5436 bytes
font_01_sfnt_off0000c71a.bin
8affaef2a6a0f02930cfc083fc1f293ef3bf56fe7986a8478cb9212f62a815e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC71A 9804 bytes