PDF malware analysis — malicious · 51bfff77c588c0cf

MALICIOUS

PDF

43.8 KB Created: 2021-05-19 13:07:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 8d5b6311ff0d48f08896c0ac69b212e5 SHA-1: cddc151a885803ba1e7e31b20a5b7ba04ed9d42a SHA-256: 51bfff77c588c0cf334e11ad3b54ce62aac34f25bfc990154fc78de32922ec53

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded URLs that lead to websites offering game hacks and free currency for popular mobile games. These links are designed to lure users to potentially malicious sites, likely for credential harvesting or further malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9648

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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/406889139/coin-master-daily-gift-free-spins-and-coins-game-hack PDF link annotation
- http://www.sovtigaz.ru/f/files/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/easy-coin-master-hack_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/robux-in_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/roblox-source_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
- http://www.sovtigaz.ru/f/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off000046a1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x46A1	24320 bytes
SHA-256: `5f3f3c2d3c03511598027ede9f570b43f66a4935ad76a099e7b669a9eff68429`
`font_01_sfnt_off00007e5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E5B	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off0000880d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x880D	18480 bytes
SHA-256: `3ccd0e6e182247473c8fd8a661e1697f212027199d1cdaa086bf60c9e83bc44d`

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