Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa89e1234d3726b…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 12:25:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9c49fe0300157b6f2538a464e97a8af9 SHA-1: d5616075b8ddfb322fafbf9112f0e6f9740661ce SHA-256: 5fa89e1234d3726bcf642660c70e0fb89a6211343d85e1bf4339d3d4a3ac6590
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links disguised as game hacks and free currency generators, such as 'coin-master-free-spins-apple-game-hack' and 'free-robux-no-captcha-or-human-verification'. These links lead to external websites, likely to host further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-apple-game-hack PDF link annotation
    • http://pustaka-smpn3tpi.com/repository/free-roblox-account-with-robux-on-it_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-hacked-maps_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-can-i-get-every-item-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-online-dont-have-to-download-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-do-you-hack-somebody-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/cheat-engine-wont-work-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/jack-hack-robuxcom_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-change-your-roblox-name-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-no-captcha-or-human-verification_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_002_off0000309f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x309F 23260 bytes
SHA-256: 710bde65512a0aefea5e83d5ea5d77970e25fd618dec20af52099ebc496030dc
font_01_sfnt_off00006520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6520 18248 bytes
SHA-256: 22847223b7fa14b103dfc30bb8a4a3b5492eeee5b482c20ddafe1417e649d631

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