Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a1313f1f8392e4…

MALICIOUS

PDF

33.1 KB Created: 2021-06-26 19:24:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0aafef6e1979b82f012be2f5433ee493 SHA-1: aa40f3af7ea42a5dc0c31c6600a8e244254f3575 SHA-256: 39a1313f1f8392e41c8f293dfcd5b17627f310627ab4023932f05203813293dc
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 0.9824

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.co/app/431946152/robux-hack-no-verification-human-game-hack PDF link annotation
    • http://stiepariperpus.web.id/sarjana/repository/how-to-get-free-robux-instantly-no-waiting_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-code-a-roblox-script-executor-hack_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/battle-royale-hacks-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/best-free-minecraft-skins_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_off00002b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B65 21856 bytes
SHA-256: 1aaee8a1bba83034e51c208d628944d460cd2425058e346b0ede79fa3e918221
font_01_sfnt_off00005b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B85 19340 bytes
SHA-256: d090ee982dcd888d67b8576407def35273c94afc23a6350d9221cd6607d3a64a

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