PDF malware analysis — malicious · 9aac9391b3de8e84

MALICIOUS

PDF

50.3 KB Created: 2021-06-03 12:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12

MD5: 8e5c73a1d81928e3d719c6c1b3c3b306 SHA-1: 4ad8330a672eba6de15420ac62a0e7dfb2f259db SHA-256: 9aac9391b3de8e843d30941fe9f5ef5b86d369b59bf6ac57174380e6362600dc

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to a URL associated with malicious redirector infrastructure, specifically promoting 'free Robux' and 'game hacks'. The document body, though partially garbled, also contains a similar URL, reinforcing the lure. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be a phishing lure leading to a malicious redirector.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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/free-robux-without-human-verification-game-hack In PDF document text
- https://www.insol-europe.org/uploads/files/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/flubhack-roblox_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/roblox-hackers-list_GM431946152.pdfIn PDF document text
- https://www.insol-europe.org/uploads/files/files/free-roblox-accounts_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_off0000557f.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x557F	27876 bytes
SHA-256: `6828f9449f74be6212f863f1bed84023356317d1138841959a656e592237a340`
`font_01_sfnt_off0000958f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x958F	2852 bytes
SHA-256: `e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f`
`font_02_sfnt_off00009f51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9F51	19224 bytes
SHA-256: `69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399`

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