Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ff9087038dd07…

MALICIOUS

PDF

41.4 KB Created: 2021-05-13 07:11:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: df140df13f285739b3de4a21ba59f36e SHA-1: 5587e26fa0f145aa83978e95c504f78b2d241c05 SHA-256: 0b8ff9087038dd07eb5f311e761ca41d119de59e08768801fb8f9a5770c60a09
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting game hacks and free spins. The ML classifier also flagged this PDF as malicious. The presence of a visual download button lure further supports the malicious intent of directing users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/game-hack-coin-master-game-hack In PDF document text
    • http://apx-centre.ru/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-2021_GM406889139.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_003_off000047ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47AD 25520 bytes
SHA-256: 1ab30a5e1dd3ecbba5fb9331e228b70ca8d3e6e2067d5f0bf0028708328e7bbb
font_01_sfnt_off0000804a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804A 17976 bytes
SHA-256: 6c4bc6518c449e74acc10e239ebc2a40e5371f7bb57007301009253b23203593