Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4aa2944d2b2088…

MALICIOUS

PDF

108.2 KB Created: 2020-12-28 22:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a1c24f11a406e1de9c98ba921565c732 SHA-1: e0b1dc951e0ff471024bac16c0a7d9e933cf486f SHA-256: 4a4aa2944d2b2088be069e3c063e763ef86e937123f36847546f8ef416df5771
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity 'PDF_SEO_UTM_REDIRECTOR_LINK' rule, indicating it functions as a free-download phishing lure. The embedded URL, https://trafffe.ru/123?utm_term=maplestory+beast+tamer+bossing, is the primary indicator of this malicious redirection. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?utm_term=maplestory+beast+tamer+bossing PDF link annotation
    • https://cdn.sqhk.co/foxidagon/4jiUMjd/4k_wallpaper_for_gamers_full_hd_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/bvKifmS/tukave.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/dazifozixawus/2019_honda_rebel_300_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78767bca-b3be-4300-af7c-6361fa5d25ec/39074657189.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/vupejogazejisikakuziji.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/74439708603.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/joy_ride_cast_members.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e001b89f-6f44-4697-8cdb-790fee188cef/spice_chart_ap_world_history_answers_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d885e22-6895-4a40-8a9d-c3c53967bd1f/niguzaretusos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc09fbe-470c-4439-b65a-feae552d6f20/45012462566.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/99968752966.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_off000165fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FC 5384 bytes
SHA-256: 7dba9dce7736be3cb2a32a4178adc3489e41437a9ffd8e9de485283add77ac2f
font_01_sfnt_off00017849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17849 15188 bytes
SHA-256: 19e39b75256194fa9a72b9eabce2ec556299a74e28fb04b7b4c67d7ee4908940