PDF malware analysis — malicious · 245c8f05e07eb8a2

MALICIOUS

PDF

45.0 KB Created: 2021-06-10 22:45:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: dbe81a9182ce2289dac97e29cf1f77de SHA-1: 8c530bf8c97e5c5c005171fae4499e4a235277d4 SHA-256: 245c8f05e07eb8a22454e2b084ba5c5e3eb3bf1868744300e3b3dee2d34db2a4

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free in-game items, such as 'free Roblox clothes'. The document body and heuristics indicate a deceptive workflow designed to trick the user into clicking these links, which likely lead to further malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 4

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.
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.tw/app/431946152/free-roblox-clothes-for-girl-game-hack In PDF document text
- https://www.woundcare-today.com/uploads/files/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/coinmaster-links_GM406889139.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/free-tiktok-video_GM835599320.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/i-robux_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/minecraft-free-school_GM479516143.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/tiktok-free-like-and-followers-apk_GM835599320.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/hack-avatar_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/www-robux-us_GM431946152.pdfIn PDF document text
- https://www.woundcare-today.com/uploads/files/files/haktuts-coin-master-free-spins_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_004_off00005239.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5239	27508 bytes
SHA-256: `f69ba7f6aef09f8cebd52101df217b2d80efdc928c7196462d46671381f6c342`
`font_01_sfnt_off00008d1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D1E	18340 bytes
SHA-256: `d29ec2e71bb068e77f351b4d123c990b41e31d257b9d9cf8b177703eed95a4a4`

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