Malicious PDF — malware analysis report

Static analysis result for SHA-256 538f8c547b9bebe0…

MALICIOUS

PDF

46.2 KB Created: 2021-05-17 14:49:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bf12c735683e39b8077333a00b550766 SHA-1: 0f1f6661fb631313ffd27b8535f16403027919a3 SHA-256: 538f8c547b9bebe0d8f81eacc707218d16d0393b908093ec329101f0066cd6b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators'. The document body, though partially corrupted, contains text and URLs consistent with a lure for obtaining in-game currency or cheats. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/master-coin-hack-game-hack In PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-online-hack-no-survey-no-password_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_off00004b55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B55 26076 bytes
SHA-256: b04d8a14e73c3d49bcca4207dae10beadf34e82eab8e6545715f97d445d34330
font_01_sfnt_off0000878e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x878E 3552 bytes
SHA-256: 1ee6f946285474c1241a9da89b51905a7f844cedb03e984b4cc51ee5840809c3
font_02_sfnt_off000093e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93E0 17716 bytes
SHA-256: abdfd9ce9c51c2315b4184c3f66e8c354c7c04da0bed37d59ef3bf7a35c4f7e9

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