Malicious PDF — malware analysis report

Static analysis result for SHA-256 51953a05a0758760…

MALICIOUS

PDF

33.6 KB Created: 2021-07-21 03:31:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 08e0ae39ff8090f30cb5a56284a6e6b5 SHA-1: dc301a46e00e38639d51bd178ff241da53a4315b SHA-256: 51953a05a07587604a2ddd1b01565fd25cb3349630fdf3afec3be9b31aa0dbf2
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 promoting game hacks and generators. The document body explicitly mentions 'Coin Master Free Spins Link Download' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', indicating a lure for users seeking in-game advantages. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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-download-game-hack In PDF document text
    • https://magistrinfo.ru/images/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://magistrinfo.ru/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-robux-scam_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
stream_002_off00002ba6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BA6 23372 bytes
SHA-256: 66d0466be873f880fddbffb7b5bd634927ba6ad1ccbf875278eb64f836cce883
font_01_sfnt_off0000603f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603F 18636 bytes
SHA-256: e0ee4d28e9fbd90893640acb023fdb3433a7d18e360fd79b0a1965f7934d0c46

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