Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7276cdd2be04199…

MALICIOUS

PDF

77.4 KB Created: 2020-12-28 14:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: aa0d42148e68687b3d3dc73c1d88cf63 SHA-1: d8627ed54492c8560de1674e2b0750655920fdb8 SHA-256: a7276cdd2be04199c73c3b1823300a34a83016667a5a7157fb5a542a12a44c23
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL https://cctraff.ru/strik?utm_term=chess+opening+lab+mod is confirmed as malicious. While no scripts were extracted, the presence of a malicious redirector strongly suggests a phishing or malware delivery attempt, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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/strik?utm_term=chess+opening+lab+mod In PDF document text
    • https://s3.amazonaws.com/bepukuba/implosion_full_version_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fe449ac759d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5fa518b69eabb.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/what_is_a_ozone_air_purifier.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/building_construction_atul_prakashan.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/95326147851.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/hotmail_hotmail.com_l_my.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fce8ec53ed13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5fb9116aa7ae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5fe5b8799e312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5f9624d0316d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64325938-0dd9-4bb9-8995-cdc31f5bc3c9/suwunezono.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 5324 bytes
SHA-256: d21445e11e34284a500801a5303864e6b502d6a83342fa67432efacfd85dfa7d
font_01_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 11384 bytes
SHA-256: 3ed64f638b8fabab28e9106762b6549ed18fe0c6a1f8405a0dd8fef17fedcbda
font_02_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 16416 bytes
SHA-256: ba11a93f5048ae8472b7177df685806fd18b8cc29be6b0d4f33ce6e98c2a9d3b