Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc6143b4d6792c…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 10:35:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ef1328de6e53c57fb10c153123e9373a SHA-1: fdeb856667ca65062c4e156d43945a81b157eecb SHA-256: 10fc6143b4d6792c7e2f8733c580b6bd512036210b79e0a4968dcae7b65724d8
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 0.9797

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/431946152/roblox36com-free-robux-game-hack PDF link annotation
    • https://www.repository.ptiq.ac.id/repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F70 24420 bytes
SHA-256: cf3cd39528aafac3430f66b99a10e3b40ddcb416dab60f04eecd384bc1484f17
font_01_sfnt_off000086ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86ED 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off0000909d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909D 18688 bytes
SHA-256: e17bde65d20b22401de6e72563f841589ec56c60b3059d89effd80f13a3186d6

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