Malicious PDF — malware analysis report

Static analysis result for SHA-256 9921ba72281c2622…

MALICIOUS

PDF

35.3 KB Created: 2021-06-26 12:35:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a44d8d12239a49086ebc2f102a920aa0 SHA-1: 4b43ae7390b3654634d84f9189cbfdf86d4a9536 SHA-256: 9921ba72281c262288c7fc84be83fa017bb3569ac8972fd76caf095c8aa17b7c
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-roblox-injector-for-hacks-2021-game-hack. The document body and heuristics indicate a lure for game hacks, likely intended to trick users into downloading or executing further malicious content. No scripts were extracted, but the embedded URLs and redirector findings strongly suggest a phishing or malware distribution attempt.

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.co/app/431946152/free-roblox-injector-for-hacks-2021-game-hack In PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/free-robux_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/roblox-cheating-girlfriend_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/hackeando-los-ordenadores-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/roblox-cheat-net_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/free-robux-no-download-no-hack_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/how-to-hacka-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/april-1-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://www.producthubhob.com/uploaded_files/userfiles/files/cheat-roblox-lumber-tycoon-2-money_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off0000344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x344A 21552 bytes
SHA-256: 431345a43e55c0bdf10e8735aaf51a525927e95774cc1f599488e9fbeee066c8
font_01_sfnt_off0000636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 19516 bytes
SHA-256: 3fc33e4eddfe68513356b9108f5ff216780a40d600d61d81fd4703544f1fa3c5

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