Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60f804730e1e721…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 22:11:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5afa757efaf7c679e2f272ee5e03fe38 SHA-1: bf02cbe84722145bea5f181335471b97a05ac7b8 SHA-256: a60f804730e1e7217cf8202762f5fd84c2cf6033d09a11fa28c7c04a87aff294
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 0.9865

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/1094591345/pokemon-go-free-kanto-ticket-game-hack PDF link annotation
    • http://perpus.stikesphi.ac.id/repository/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/100-free-spins-for-coin-master_GM406889139.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
stream_004_off0000510b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510B 24416 bytes
SHA-256: 487009e2f72beb35a55af6e9e94b539a931fc7df1d0c805ead33e0ba61fdae29
font_01_sfnt_off0000883a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883A 18292 bytes
SHA-256: abc47695c9d776cfdb82638a088589676013d0438d7d0b6c13a8ac3105052003

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