Malicious PDF — malware analysis report

Static analysis result for SHA-256 52415ab970edc244…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 16:55:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3a1e67c71323f6544d4f2046af0a024e SHA-1: aaa57b6e1a56f1cdb74b02efc45f97681816124f SHA-256: 52415ab970edc244ca3cb2bc249511f291b0d62356bf1eb013fba6377723c7a9
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/free-robux-that-actually-works-2021-game-hack PDF link annotation
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-candy-script-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-cursed-roblox-gear_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pubg-uc-via-login_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-draw-trolling_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-robux-bc-accounts-codes-more_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-sweatshirt_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/youtube-roblox-dax-she-cheated-roblox-code_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/da-hood-update-drum-gun-cheats-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-have-a-coo-roblox-avatar-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/dev-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/travaille-dans-une-pizzeria-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-windows-10-for-free_GM479516143.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_off00002e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E27 22176 bytes
SHA-256: 1dd1e537b08c4edfdc407d4df600b6eb87a43e2b2cd4593ab07812e3e0a61956
font_01_sfnt_off00005f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6A 20008 bytes
SHA-256: 8708610d65edee27054ce301a9bd75c7c559fd6231599c341fc0984ebcbede77

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