PDF malware analysis — malicious · be13a87818062f58

MALICIOUS

PDF

51.7 KB Created: 2021-06-03 18:17:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 4fd58df697b418f2b9d9bf67cffacafd SHA-1: 128c5f698de218b5c0fb65e005e16d7589687d67 SHA-256: be13a87818062f584d4b3c804e1bd96b83bb2c9fb67585ab703a3968b8095bc2

82 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 0.9657

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.online/app/431946152/robux-prices-game-hack PDF link annotation
- https://cuc.ac.cr/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-roblox-com_GM431946152.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
- https://cuc.ac.cr/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00004fcb.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4FCB	26472 bytes
SHA-256: `a504b15835ba240e678feb32b5e41d5f07dc722566b8ca728dfa0075cb37800b`
`font_01_sfnt_off00008df5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DF5	3884 bytes
SHA-256: `40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf`
`font_02_sfnt_off00009a98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9A98	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_03_sfnt_off0000a7a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA7A9	18124 bytes
SHA-256: `d6c4a79c1b877100ce6482b1b164fdc7adac613b1876b5752fde1291de88c7d2`

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