Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61d88dbd7b28475…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 13:23:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1fa11f7d7d01eb3adf981753874321aa SHA-1: 3468061f4d998b3087c68297d283be53f2041b42 SHA-256: a61d88dbd7b28475255f73888f033ceee1268a9cafd7eab8a0b42313a57f31c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The document body explicitly mentions 'Coin Master Free Daily Spins' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score suggest this PDF is designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-daily-spins-game-hack In PDF document text
    • https://www.fishboat.hr/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/750-robux-free_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/free-sets-suicidegirls-roblox_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • https://www.fishboat.hr/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/online-roblox-free-play_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/roblox-hack-apk-2021_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.fishboat.hr/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://www.fishboat.hr/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/roblox-hack-scripts-download_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/roblox-freebies-com-hack_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/how-to-hack-coin-master-computer_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_002_off00002f6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F6F 22824 bytes
SHA-256: 6b837382ee82c93bfc4c24fcf327e63d9ca08eae99baca0d6a0b01ea18e77369
font_01_sfnt_off0000625d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625D 18596 bytes
SHA-256: 9cc88ea50ead10f9f912dbf4be3878b8b313467d4147098bf597ecbc2abb3a30

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