PDF malware analysis — malicious · c95edd9ef821923b

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 16:17:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 6cfed3bd2d80af55a7202d7d9e4c5114 SHA-1: fb26c7a972d0a12a87a6d770a9e01c0e78362d88 SHA-256: c95edd9ef821923bfe74d98938188204289877ff537df79c6f22aecac23b1ae1

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, specifically mentioning 'free coins and spins for Coin Master'. This, combined with the embedded URL, strongly suggests a phishing or scam attempt to trick users into visiting a malicious site. The document body, though partially corrupted, contains similar phrasing and the malicious URL, reinforcing the lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

Heuristics 5

PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE

Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
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
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/406889139/free-coins-and-spins-for-coin-master-game-hack In PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/wurst-112-2_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-youtube_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-games-on-roblox_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_004_off0000512a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x512A	27096 bytes
SHA-256: `6bb3bd619d08648911045a62174ff02f3ff5724821acd61a9113d0ff0cb601cd`
`font_01_sfnt_off00008f1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F1B	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off000098cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x98CD	18060 bytes
SHA-256: `f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120`

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