Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9722e040f194aa…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 12:33:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8d9cb7057ea4d6117de9e80e0da9d0fc SHA-1: 8dfd7cf30a6b2b77daea8a3b50b0df9d289c39de SHA-256: 3d9722e040f194aaec1c7b23ea6c56e335df46fc2c61360f3532b3715a91a3f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing indicating it links to a malicious redirector disguised as a game hack generator. The document body explicitly mentions 'How To Get Free Robux For Free' and includes the malicious URL, strongly suggesting a phishing or scam lure. No scripts were extracted, but the primary attack vector is the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/how-to-get-free-robux-for-free-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/5-roblox-edit-this-cookie-hacks_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-creator_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-2021-may_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-planet-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-roblox-boxing-simulator-2_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/is-there-any-way-to-get-free-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_off0000304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304D 21984 bytes
SHA-256: 499e718c85093a70ca59b85e95b957977a639ddfdd41d956da5bd4d833d69bcd
font_01_sfnt_off00006103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6103 18984 bytes
SHA-256: b02f235e187ca63825268846ce24859b9c73d6f06522f0e44481555b58ecada8

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