Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6591cacb0cb43d0…

MALICIOUS

PDF

47.0 KB Created: 2021-06-09 03:32:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0df7747ea05087fe13fd31e27ede6e20 SHA-1: a8ca042f513dc465c57d8481ab8ceaa473eb48cd SHA-256: a6591cacb0cb43d05b2677d83ce733265b75daf1ea29f6ed7f484c868a770425
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external websites, including a primary malicious redirector. The document body and extracted URLs suggest a scam related to free game currency and hacks, likely intended to lead users to phishing sites or malware downloads. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/free-robux-viseo-not-clickbait-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-piano-keyboard-hacks_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-top_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-april-2021_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_004_off00004d8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D8C 24692 bytes
SHA-256: c19a1643ca9fbfe3ae6b0abca3a008c00683307bb381ed6a44688a8778c23e57
font_01_sfnt_off00008627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8627 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9339 18844 bytes
SHA-256: 25d52b8ffb941a6a7386d775a051b245fa0143cd30f0950b4a1c01bbfbbb530d

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