Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a90650df6f49b9a…

MALICIOUS

PDF

46.0 KB Created: 2021-06-04 01:38:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bcca392bcc23b67b484ef562c8dd9703 SHA-1: 053715a567d39535c6ae3b6acc7bcb6ec9e4de34 SHA-256: 1a90650df6f49b9a346a193ef5d0ce027e271cc6f098db4cf9936a13f7a7a593
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 0.9864

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/get-free-spins-on-coin-master-2021-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/tiktok-free-open_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-free-exploits_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_off0000522f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522F 29824 bytes
SHA-256: 978c51c99b5e9e1b398ba1014c323061d4e8eeeaf22b1188dc6b1650becda16e
font_01_sfnt_off00009155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9155 18288 bytes
SHA-256: 51edae499e96af11139ef94313efcbf906f73cd888d739ca20624da83f1b55af

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