Malicious PDF — malware analysis report

Static analysis result for SHA-256 2159454e8bcdaa80…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 00:10:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 38277ca00add1a9a887e7f8521f53d3e SHA-1: e58616fd2e6535321c302d5a3838be5c84a5a217 SHA-256: 2159454e8bcdaa80d8b66b02f38d0a86f744c63b47b583daf25e20f503141118
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/835599320/tiktok-free-crowncom-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/roblox-btools-press-n-script-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-into-any-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hack-roblox-lumber-tycoon-2-axe_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robuxreward-net-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-crack-free-robux-robuxmaniac_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-tuto-hack_GM431946152.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/download-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-pets-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/can-u-actually-hack-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-sights_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/si-un-hacker-te-sigue-en-roblox-te-puede-hackear_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
font_00_sfnt_off00003326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3326 22352 bytes
SHA-256: 50b803cba4adef10796a226925562980f1a0d32bea29e7ee5618a3b4f6b61409
font_01_sfnt_off000064ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 18396 bytes
SHA-256: ba3f16c7d8f0126629a5a7bd6206b0b1786e274b5bc03ba33750f34e48cf8afd

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