Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7fef51b0f1a365…

MALICIOUS

PDF

44.4 KB Created: 2021-05-11 12:46:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: de01b26c6459e03f4c2178f8574d0e6f SHA-1: 584e766595b3faafca6b42b1597ab2378fe7990a SHA-256: 8f7fef51b0f1a36523a637d34e6b3b06bceb6117b467026ff0ee72f74ec6fcc0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirector domains, specifically advertising 'free generators' and 'hacks' for popular games, which is a common lure for phishing or malware distribution. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicate this malicious intent. The document body also contains similar promotional text and URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/mcpe-master-hack-unlimited-coins-latest-version-game-hack In PDF document text
    • http://zarinnameh.ir/images/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-spin-today_GM406889139.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_off00004791.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4791 24568 bytes
SHA-256: cb20132683b7f2df1ff29489404c1732d92481e5d7bed2f27b65f99924236b48
font_01_sfnt_off00007ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFE 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000089af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 18720 bytes
SHA-256: 9a564b0c0a644540a66c1b1ff06b652386e2dfb1d0e582b0e17ab2c442631031

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