Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b90af152fa48a6a…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 14:40:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d8eaccb94d18767d1e4f18e3ffd9072 SHA-1: 10f933fd006748fa09ecc86af113493827bf467b SHA-256: 9b90af152fa48a6a79871e8cae48549ab85b54757bc88ebaf43d5f092ecd1ed4
102 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 0.9971

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/how-to-get-2021-robux-for-free-game-hack PDF link annotation
    • http://118.174.0.244/UserFiles/File/daily-free-spins-coin-master-heaven_GM406889139.pdfPDF link annotation
    • http://118.174.0.244/UserFiles/File/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/i-want-robux_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/roblox-generator_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://118.174.0.244/UserFiles/File/rbx-hut-promo-codes_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
stream_003_off000048aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AA 25504 bytes
SHA-256: 027fc7e33d02929ee7d3f27939832cf592865cb8e710c0dd47ae4b6b68b75371
font_01_sfnt_off00008414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8414 18684 bytes
SHA-256: 6e9c0eecafd635f65838c8dbfb1e23e8457e4c9239d4b33e445d621fd980b18f

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