Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10d0d03550c8646…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 09:44:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5c97f806139fe5c9df88e3ea1cd8e370 SHA-1: 3db8b8d5d9895bb3daf47253e17f0ec0c53faef1 SHA-256: f10d0d03550c864671deafe26d2d5b8b6696da5ca5e67ecb13000aa396f9d88e
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 0.9865

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 https://netcdn.online/app/406889139/coin-master-apk-hack-mod-download-game-hack PDF link annotation
    • https://library.institutpendidikan.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/can-u-get-free-robux_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_004_off0000552f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x552F 24860 bytes
SHA-256: 3a0e026d0140098067ed62d4e0ce022164db8a9ae098695426eb13b23e19d334
font_01_sfnt_off00008d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D55 18472 bytes
SHA-256: 9ab3b4b182d28f91be74dc6255d436493892cab70750f0f5ae683b970a059213

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