Malicious PDF — malware analysis report

Static analysis result for SHA-256 c541e440ba8f4fea…

MALICIOUS

PDF

47.7 KB Created: 2021-05-12 02:36:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f4882b3c3b3986cb87786887c187ff5b SHA-1: 5ff4cdebd430b2ee181bacf1017e7db860d9b1e8 SHA-256: c541e440ba8f4fea6d9f691094c3611ac2d4508f3b019a50cc6db9964112c326
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a "GAME_HACK_REDIRECT_LURE" and a "MALICIOUS_REDIRECTOR_LINK", both pointing to the same URL. This indicates the document's primary purpose is to redirect users to potentially harmful content, likely for financial gain or malware distribution. No scripts were extracted, but the presence of embedded URLs and the lure theme strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/how-to-make-a-private-server-on-roblox-for-free-game-hack In PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-comcom_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/robux-download_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-skins-boy-free_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_off00004c04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C04 25468 bytes
SHA-256: 2bcaf9f41104e5d9d9be5393d6af0412f173dc86e8a1e76ec2daa39a5d1dc3fd
font_01_sfnt_off000086df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DF 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off0000956b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x956B 19196 bytes
SHA-256: b86313febfc454b426d55667776bc2f57fbcac051d8b12890de5d5336413d825

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