Malicious PDF — malware analysis report

Static analysis result for SHA-256 905fbd928cbe16a2…

MALICIOUS

PDF

44.3 KB Created: 2021-06-07 06:21:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 430e1ba941f33c9b0fa03425467f724a SHA-1: cadca08132e09225b4bf1c65013628e204d8e2be SHA-256: 905fbd928cbe16a2e0e74c1c0289ebe967545e7067dba966c8eca34c9a3cba9f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic firing indicating it links to a 'free generator / game hack' lure, specifically mentioning 'free Robux'. The document body and extracted URLs reinforce this, pointing to URLs that promise game-related cheats. While no scripts were explicitly extracted, the PDF structure itself can contain malicious JavaScript, and the primary lure is to redirect the user to a potentially malicious external URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-robux-free-no-survey-game-hack PDF link annotation
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/cool-avatars-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/pubg-uc-qiwi_GM1330123889.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-account_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • https://www.roblox.coIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F52 26484 bytes
SHA-256: d70cddd53403fceb3a4fd386a311e0c933b0016802f213db73156c995ccd1501
font_01_sfnt_off00008a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A56 18308 bytes
SHA-256: d3a10f634c5ecc3d7353c949fdf4d39280fe41fff4e373acd575ae0d5bea3c9d

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