Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0c49237ca302ee…

MALICIOUS

PDF

37.1 KB Created: 2021-07-05 07:00:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 88a628b94cb828ada0dc38282f35718d SHA-1: f4c6ffc613fd6d418b055405e16d836398e577e6 SHA-256: 9b0c49237ca302ee22db3e6ddac4a43b3b90ab1e4d1c4e8204a8ba987c03b4c7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to 'netcdn.tw' which is flagged as a redirector for game hacks. The document body and heuristics indicate a lure for game-related cheats or giveaways, likely to lead users to malicious sites. The presence of many external PDF links suggests a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/406889139/coin-master-fan-page-giveaway-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hack-para-tener-robux-enderobux117_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-mining-simulator-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-tokyo-ghoul-bloody-nights-level-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-get-robux-for-free-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/best-hack-guis-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robuxian-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-hack-menu-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-hack-unlimited-robux-apk-download_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/why-cant-i-buy-free-hats-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-audio-sounds-songs_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-case-clicker-cheats_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-hack-for-robux-kredi-kart_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-virus_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/prison-royale-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-free-fraw_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-adidas-sachen-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-the-skeleton-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F70 23008 bytes
SHA-256: bdde4f5391198c7ea6f79d05501a6993d7c6c4cb537231f3d9ba540e9a8be211
font_01_sfnt_off00006335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1A 18608 bytes
SHA-256: 1729869f62bf605446ac18fa88fd71300f8badfb5eb5e4d6b045fb0d814fd4de

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