Malicious PDF — malware analysis report

Static analysis result for SHA-256 f661146c26df27bc…

MALICIOUS

PDF

32.6 KB Created: 2021-07-19 00:35:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3cbf494421cefa6e1841858c9eacdd65 SHA-1: bf71f7a5b9ae6ed3dd2cf704c5910b579050a45b SHA-256: f661146c26df27bcf7396a9a0fe621cef729c68bafaf2f8f628c316e249e9019
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free spins' and 'hacks' for popular games. The heuristic firings indicate that these links lead to known malicious redirectors and are part of a game hack lure. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs and a visual call-to-action button, suggesting a social engineering attempt to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9452

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/406889139/coin-master-free-spins-link-today-new-game-hack In PDF document text
    • http://possumholler.us/images/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://possumholler.us/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://possumholler.us/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://possumholler.us/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://possumholler.us/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002727.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2727 23576 bytes
SHA-256: f571763e63e6fd1adbcb049c1bcdd6c066f25affd6e7e275b70f33fa87ccab95
font_01_sfnt_off00005c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C99 18572 bytes
SHA-256: 51c95658009ee6a6ae875a8d4133a79c51d36fbd34bac1203a2f2fe060da7c96

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