PDF malware analysis — malicious · fd4a5417538c3bff

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 16:34:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26

MD5: 4e2097249307dd9a37e532201842549e SHA-1: a79e62c7aa86db5d5ec7b6669d984e63b1ae0894 SHA-256: fd4a5417538c3bfff1b08a325e7c0a75db8fbe3a2d7b9e43bcf3f6d9b9942740

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a "free generator / game hack" lure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attempt to redirect users to potentially harmful content.

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.online/app/431946152/www-robux-com-game-hack In PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/rbx-free_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/get-free-coin-master_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-reddit_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-survey_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-game-free_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/buy-robux-free_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/roblox-premium-free_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-robux-clothes_GM431946152.pdfIn PDF document text
- https://www.andrology.co.uk/uploads/files/files/free-spins-on-coin-master-link_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_off00004f16.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F16	25780 bytes
SHA-256: `47d95183c4b567fe5e526fd18fd76869491e53d3f42b2674fa2b0fb4b14b8638`
`font_01_sfnt_off00008b3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8B3F	18472 bytes
SHA-256: `5fb9c020dfaedbf87c4a2d1928ca13225aae827a6af2df864dcdcd5b9ec7e552`

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