Malicious PDF — malware analysis report

Static analysis result for SHA-256 357678c7048530eb…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 00:20:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4d13b37b7729186cfe1b7952d73d92ac SHA-1: 623f057605bb4784e00137dee1dd41d6735bfe38 SHA-256: 357678c7048530eb04041cce2c985c8f71f5652a614845cd3d59f103edc8a969
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-game-hacks-game-hack PDF link annotation
    • http://library.umuslim.ac.id/repository/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-use-slayer-leecher-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/good-outfits-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-shirts-on-roblox-without-builders-club_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-robux-daily-no-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/get-free-robux-by-watching-videos_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/dll-script-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-account-pin-hacked_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/shark-bite-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox-re_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_off000031b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B9 22204 bytes
SHA-256: 2bb5eca81b49e21a96deaddc499f0969008b38c10a7a533264cfc128b5021ff8
font_01_sfnt_off000062b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B4 18264 bytes
SHA-256: c1c21b29a6afb4d06e4d6845aa9afd5500216469eff45eb2d027be7bd9c24dc5

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