PDF malware analysis — malicious · 643059b361a614ce

MALICIOUS

PDF

36.1 KB Created: 2021-06-27 02:21:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 991eb1a73c009ea1f1aea57d6bcf5153 SHA-1: 34fc557d554bab37b8fa6f732e071bfb62eb6579 SHA-256: 643059b361a614cef4b924919472ab2524d6be5093bab3eeac874f82383134eb

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and sites offering free game hacks and currency, indicating a lure for users to click through. The document body, though partially corrupted, contains references to these lures and embedded URLs. The primary malicious activity observed is the redirection to potentially harmful content, likely for further exploitation or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/site-17-roblox-hacking-game-hack In PDF document text
- http://achauco.vn/public/upload/files/coin-master-homepage_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/minecraft-mac-free_GM479516143.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/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-to-get-free-boy-hair-on-roblox_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-to-get-free-unlimited-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-robux-no-download_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-robux-scams_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/allsmo-free-tiktok-and-instagram_GM835599320.pdfIn PDF document text
- http://achauco.vn/public/upload/files/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
- http://achauco.vn/public/upload/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
- http://achauco.vn/public/upload/files/free-roblox-abs-tshirt_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/www-free-robux_GM431946152.pdfIn PDF document text
- http://achauco.vn/public/upload/files/how-to-get-free-robux-as-a-kid_GM431946152.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_002_off00003433.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3433	23204 bytes
SHA-256: `95072cdb430d12ea21fe5063a0fb6576b74a1510a8be6607e5498bb0a4efe958`
`font_01_sfnt_off00006839.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6839	19044 bytes
SHA-256: `9dedc8d79f64960fa55851ec57ddd487cedbb53abbcdd0b8c8ddd7b780fdba0b`

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