Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8beb00aec6cacc8…

MALICIOUS

PDF

45.2 KB Created: 2021-05-14 01:30:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 64e04b9a383530a1b64af0a65f09a305 SHA-1: 09b94b45480b037460d419b78d3abfb3c5a2e344 SHA-256: b8beb00aec6cacc871ff096372a05012707e99e80e3ad89c1b38a68b0ab1aef7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains references to these lures and embedded URLs. The presence of these links strongly suggests an intent to redirect users to potentially harmful websites for scams or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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/free-spins-for-coin-master-game-hack In PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A04 26020 bytes
SHA-256: 718383c69b37fc5b2dcc8a963475377998e254ed0d8f923e1d4de0bff2406161
font_01_sfnt_off0000859b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F86 17884 bytes
SHA-256: 7a686c540965cac69e1923dfbb6a78ce3f92ec60dbbf6836da21cbb58cd4d6cc