Malicious PDF — malware analysis report

Static analysis result for SHA-256 d389a051645f1114…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 22:44:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 62accad34ee2ab561b6cb5e3e7b53955 SHA-1: ddf8eeb75e88276dac1a38e44956f75e59eea059 SHA-256: d389a051645f1114200482d836bc19cf3f7676b38323ea1feeb44ba45a1e0935
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector, masquerading as a game hack generator. The document body and heuristics indicate a lure for free game currency or hacks, designed to trick users into visiting the malicious link. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack.

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/free-spins-coins-coin-master-game-hack In PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-100-percent-real_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/get-free-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/pc-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-tix-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-roblox-credit_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-noclip-no-cheat-engine_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-roblox-accounts-not-used_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_off000031b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B4 23280 bytes
SHA-256: 6d7b55d376a8c897a3fbd85f79cbea10922470e989a47a19cc6f7aa3f35b67e6
font_01_sfnt_off00006559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 18176 bytes
SHA-256: e8ec895f495d139acdb298d515a7ca0fffd25b58e102aa71b0a100d8abb1bbce

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