Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f22cc1ac971105…

MALICIOUS

PDF

34.0 KB Created: 2021-07-09 18:12:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e8d354a626c59b55edf23c41b70f2278 SHA-1: dc205564901be814aeefd897d147761f53ef6644 SHA-256: 99f22cc1ac97110530156ead61bb198146181c8a4edf728fe4c96ee2059d42fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The heuristic firings indicate a critical risk due to the malicious redirector links and a lure for game hacks. While no scripts were explicitly extracted, the embedded URLs and the nature of the lure suggest a phishing or scam attempt, likely intended to lead the user to a site that may host further malicious content or attempt to harvest credentials.

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/se-puede-hackear-coin-master-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/earn-robux-websites_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-free-draw-how-to-draw-a-vagina_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/2021-roblox-hacking_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.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
font_00_sfnt_off00002ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDC 22948 bytes
SHA-256: 4cfb1aa2ab1313fcd024f89ba6e06901ba6d87a1f026dce392ecf62576448303
font_01_sfnt_off0000616a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 18472 bytes
SHA-256: e5740f0ed58e13a3d9045bf65c0b8a8b544c8b7064c4982ad243504192595383

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