Malicious PDF — malware analysis report

Static analysis result for SHA-256 15453591ac09e4a6…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 23:16:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 703f8c0f9ac616c17d6ac43325172883 SHA-1: 113ab699973948a6c6fc5b858d554d817b7e7efd SHA-256: 15453591ac09e4a64cc97a18e3b5558cf22217e4b050f730ff394ede5fea3172
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/431946152/play-roblox-for-free-on-google-game-hack PDF link annotation
    • http://lib-smansumsel.sch.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-jailbreak-hack-client-redboy_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-games-browse-our-selection-of-free-online-games_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-games-you-can-play_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/cheats-roblox-mega-fun-obby_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/fps-universal-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E20 22724 bytes
SHA-256: f43b14c3225aa40050ab6a426426c2a23638d907cf0218ea60f892ecf0041308
font_01_sfnt_off0000608a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608A 18984 bytes
SHA-256: 56ffabe4933183b7fa722280210ce5f85d8428cd1a4b636c5686816a68fd1a3b

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