Malicious PDF — malware analysis report

Static analysis result for SHA-256 c439b7939e0be294…

MALICIOUS

PDF

33.9 KB Created: 2021-07-19 14:10:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 74c882b263d735caedc8bfa0d16990d4 SHA-1: 75cbfd7a21244ca90eef9d6003511533ffe2b9f4 SHA-256: c439b7939e0be2946513f0b9094fe4efa7f6fe664e95957dd68eb2e463cb40ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generator / game hack' and 'free views on Tiktok' lures. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that are designed to lead users to potentially harmful content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://netcdn.tw/app/835599320/free-views-on-tiktok-game-hack In PDF document text
    • http://akademiatenisa.org/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://akademiatenisa.org/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB5 24016 bytes
SHA-256: 189e72116c5cbf42d9db3246fd87bb77911da90b2bf3b1274e894bb12fe33390
font_01_sfnt_off00006543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 17752 bytes
SHA-256: 0bba4198fd0ca9d20010dde6368f831223727c1fd110b32f8bd9ae0070f69573

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