Malicious PDF — malware analysis report

Static analysis result for SHA-256 64befccb03659c5a…

MALICIOUS

PDF

29.8 KB Created: 2021-07-18 23:18:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6c75d2423f72d53313df217a9067431a SHA-1: 8ead83a8c8d8f134c78584142391bbd68af0daea SHA-256: 64befccb03659c5a942ff9d702c99baa715e28d3aa113c3b9848b5c66bc5b622
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising a 'free generator / game hack'. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick the user into visiting a malicious site, likely to download further malware or exploit a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

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.
  • 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
  • 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-tiktok-likes-generator-game-hack In PDF document text
    • https://ogm-goettingen.de/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://ogm-goettingen.de/images/free-likes-on-tiktok_GM835599320.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
stream_002_off0000223a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x223A 22420 bytes
SHA-256: b7811ea501cbcfeb813d394a2fc17ceaefb5cf1d069b514375f7c9ff64da0fcc
font_01_sfnt_off00005485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5485 17684 bytes
SHA-256: 5a858a9ba580e5964a46b2eec995bc00b893a7f5d7a57062f00620da516a4987

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