Malicious PDF — malware analysis report

Static analysis result for SHA-256 a580e50a3013afae…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 22:58:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e0f30425b8660e17580e3b38e71d6635 SHA-1: 98b9979c18fbcaded7e37da8f722eec8087df7bd SHA-256: a580e50a3013afaeb7da7d9206a9b6fed423dd6fa985184f33283e1a0d407691
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks and free spins, designed to redirect users to potentially harmful websites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/is-there-any-tricks-or-working-hacks-for-coin-master-game-hack In PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/my-roblox-account-got-hacked-what-do-i-do_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-devil-fruit-one-piece-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-cheat-engine-debug-roblox-without-crash_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-bloxburg-hack-money_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-crack-a-roblox-hack-made-in-visual-studio_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-ohne-handynummer-und-menschliche-ver_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
stream_002_off00003372.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3372 23188 bytes
SHA-256: b849343557a77f11d0b6b4624b6ed213b93d248ea7b280b6ec364f63784137ea
font_01_sfnt_off000067f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F3 18712 bytes
SHA-256: 4a03d0d5027669f9bbd7cdc09a387a8a870f705948380e02b2a52a8fc72dae2d

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