Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b89ef525de2f2…

MALICIOUS

PDF

41.7 KB Created: 2021-05-10 17:37:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aa1d52c45401cd8363afb1792ca9319b SHA-1: 42a002454476a43bec69f6e8fb0f5ee64bbc2cc3 SHA-256: 115b89ef525de2f21bb558bf1fee4a24ab8fa0fcc26eb6cd5df391896eb4bf73
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9979

Heuristics 4

  • 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.xyz/app/431946152/rewardrobux-com-game-hack PDF link annotation
    • http://www.htc.edu.au/images/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://www.htc.edu.au/images/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-spins-coin-master-hack-2021_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_003_off00004370.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4370 26032 bytes
SHA-256: d7445be7cb27924e4a55f293fd8c9abf42137f05cb70513cd64e15bb29c1b4a0
font_01_sfnt_off00007fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB2 18676 bytes
SHA-256: 7669e564bd091b207fd11e388173a1fc76ed62ef873f42ab23981861f0020ac0

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