Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68b20a6e27af896…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 10:53:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 64e42035fb8ed596987dab8e4e9942d6 SHA-1: 8a4c830b0d677a378e9f5a69a9d843b22be9dc33 SHA-256: f68b20a6e27af8962f7ddaf57b1d88d339f50bb4bf40678a4f3a69a0cc2f0864
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 0.9832

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/431946152/free-robux-generator-2021-no-human-verification-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-cs-ro-hack_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/pokemon-go-free-gift_GM1094591345.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/pastebin-free-robux-no-wait_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-codes-not-used_GM431946152.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_off000052c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C6 26556 bytes
SHA-256: fbbb8b9490db676545d0fb08084b69af5225853d4165b6a35d0a4ec03abacf1a
font_01_sfnt_off00009062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9062 19260 bytes
SHA-256: c7b90a5cfba5c375f14137d6940681acb1ecffd006539937a4c5badd529f0ccc

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