Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4476e0d3b0f437…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 23:46:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5a9c829361b6d7497be449ffc912b10d SHA-1: 9fc4e6cb396e4c52430468a035bcba05010679e9 SHA-256: 7f4476e0d3b0f4376a854a41f36e108858e3fd225d6f2a4e2be52444b219e915
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/479516143/minecraft-java-free-download-game-hack PDF link annotation
    • http://elib-sd.msj.mis.sch.id/library/repository/free-pushable-noob-models-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/robux-free-robux-robux-robux-robux-robux-robux-robux_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/https-webrobloxcom-catalog-202120215-hacked_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-hack-roblox-ninja-legends_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/money-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/free-reedeem-codes-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/hack-mega-matar-gente-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/youtube-hack-aimbot-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/robux-hacks-that-acctualuy-work-for-everyone-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/mobile-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/robux-hack-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/packet-of-world-free-roblox_GM431946152.pdfIn PDF document text
    • http://elib-sd.msj.mis.sch.id/library/repository/free-tiktok-followers-no-survey_GM835599320.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_off000033c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C0 22500 bytes
SHA-256: ded9f5b04aeee3d9bdcd7f50409f0e589dbc80e8ab8584037b8a0b268861e1a3
font_01_sfnt_off00006564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 18856 bytes
SHA-256: b0096c3c5e481a4f2c1c49fcffa9b92b3b8114a7f846d47264883f0ea9db8c51

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