Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a86d5c6b44e71d…

MALICIOUS

PDF

45.7 KB Created: 2021-05-12 07:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e5a76cb958283038c2bb5d61d53a59d SHA-1: 650fb8b45fea8b1c3cd8790af2832c68df14b5f2 SHA-256: 55a86d5c6b44e71d60020c11f1f8614ad9af2d5709a0610d0fd0af459b436f05
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple embedded URLs that redirect to malicious infrastructure, specifically a known redirector associated with scams. The document body and heuristics indicate a clear intent to lead users to potentially harmful websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/free-robux-generator-for-roblox-2021-game-hack In PDF document text
    • http://sports-service.com/images/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://sports-service.com/images/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://sports-service.com/images/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sports-service.com/images/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://sports-service.com/images/coin-master-villages_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_off000049b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B4 25416 bytes
SHA-256: 4bce0084977b10d8c14d4eaaaee2f5964e1fe065c437684abc65f34d1185c30c
font_01_sfnt_off0000847d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x847D 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2E 18820 bytes
SHA-256: ebe9c90542e8fe2fea15c90130dc88571bff9717049b6ef0e566bae53a322baf

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