Malicious PDF — malware analysis report

Static analysis result for SHA-256 611332a61332a38c…

MALICIOUS

PDF

35.1 KB Created: 2021-06-18 16:38:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 32bf655f5e4509c6cd8961d0ee82afdf SHA-1: 11caf8449be0e1569313f05d302147a98d1dff4d SHA-256: 611332a61332a38c7b20ccf99081aa0688c75fbb06c6ee3a5fbb94dd2d7761fc
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file 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

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/how-to-save-a-free-model-in-roblox-game-hack.
  • 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/how-to-save-a-free-model-in-roblox-game-hack PDF link annotation
    • http://digilib.unbari.ac.id/repository/best-free-hair-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/promo-code-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-kohls-admin-house-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/pubg-uc-100_GM1330123889.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-platesoffatemayhem-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-meme-skins_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-can-you-get-free-donations-in-roblox-for-robux_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_off000030a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A7 22812 bytes
SHA-256: df04d96203c94bd257b80fde0bb97cb37ffce0deaa14c7a63ae63045bc61c627
font_01_sfnt_off0000639d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639D 19300 bytes
SHA-256: c1e38ebad6e4eb9811aa253112ff2cbfd06da06c85f973eb6818d813ecdcde8f

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