PDF malware analysis — malicious · e3efe6feef9e2d3c

MALICIOUS

PDF

41.8 KB Created: 2021-05-11 20:57:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 59c0b16f4d4e9a60a5e516b2d9db0021 SHA-1: 0b94b099325aa9b2f175f547c6b5dc315af2d0eb SHA-256: e3efe6feef9e2d3c1c9cae3c4fa5f5c6f62a25c0cb0990e3fb5906d8c18e8201

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites that promise game hacks and free in-game currency, such as 'Coin Master Free Spins Heaven' and 'free robux'. This indicates a likely phishing or scam attempt designed to lure users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

Heuristics 6

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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-free-spins-heaven-game-hack PDF link annotation
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/free-robux-pins_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/free-flip-master-coins_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/games-like-coin-master_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/free-roebucks_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/coin-master-free-link_GM406889139.pdfIn PDF document text
- http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link-2021_GM406889139.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.

Filename	Kind	Source	Size
`stream_003_off00004bb3.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4BB3	23876 bytes
SHA-256: `2dd69417ba4074b88de010bc64aa9f6b0b3879fd44fa2127074f77dbb8a4d2e1`
`font_01_sfnt_off000081ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x81EF	18000 bytes
SHA-256: `1a7a942824b06f750bb78f0ac6c20b575c890bd3bb0b70b48d1c99cd2ce212d3`

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