PDF malware analysis — malicious · 4b7aa07639bdd209

MALICIOUS

PDF

49.0 KB Created: 2021-06-03 07:54:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25

MD5: 85415107b595d664957b3a9fac6ec29a SHA-1: 09f310d415ef7dace04ace95f2e85d44310f728a SHA-256: 4b7aa07639bdd2090df9a5cc1cba4b9bcd940db2350f595224495778b6aa9451

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and generators. The ML classifier also flagged this PDF as malicious. The presence of embedded links and the lure of free game items suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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.
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.
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-for-flip-master-game-hack In PDF document text
- http://achauco.vn/public/upload/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
- http://achauco.vn/public/upload/files/what-games-give-you-robux_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-roblox-templates_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/coin-master-levels_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-tiktok-views_GM835599320.pdfIn PDF document text
- http://achauco.vn/public/upload/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
- http://achauco.vn/public/upload/files/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-spin-and-coin-blogspot_GM406889139.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_off000050ac.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x50AC	24800 bytes
SHA-256: `f0ba6becc4e63b1affe72ad2133c8952001cf61d6fc26e980a28314c9dd7d8e4`
`font_01_sfnt_off00008990.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8990	8676 bytes
SHA-256: `e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468`
`font_02_sfnt_off00009e1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9E1B	17960 bytes
SHA-256: `02313c49670fbf7343f00752d4f8f282f2b389028f73da699401a8e4fa62a38f`

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