Malicious PDF — malware analysis report

Static analysis result for SHA-256 384ce7ce1561220a…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 09:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 190288527370c31c9033ee7d98e4ab37 SHA-1: 0f47deac55bc7e6c346fc55bb03d59ebf9d13f30 SHA-256: 384ce7ce1561220a10b363c4697be3ec5a52331efabf4224942fa340ac8d2265
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them, promising game hacks and free currency. One critical heuristic identified a link to known malicious redirector infrastructure, and another indicates a link farm structure. The document body explicitly contains the URL http://netcdn.tw/app/406889139/coin-master-hack-app-for-iphone-game-hack, which is likely the primary destination for the lure.

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/coin-master-hack-app-for-iphone-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-into-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-inspect-element-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/make-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-cards-pin-number-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-pokemon-cheats_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/snippet-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pubg-uc-and-rp-generator_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-unlimited-robux-for-free-with-copying-notes_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-become-antman-for-free-roblox-sharkblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-2021-website_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_off00003094.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3094 22344 bytes
SHA-256: cb3ba9ed4e5f857c55d5053de643de5145dc127265f72f17f885cd7441e6345e
font_01_sfnt_off0000626c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 18512 bytes
SHA-256: 7745d005a4717d66690e1bbddb99291b25b8a5c762b991ae2cab35147c3293f6

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