PDF malware analysis — malicious · f9bf53511b6d07f2

MALICIOUS

PDF

35.5 KB Created: 2021-06-18 11:12:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12

MD5: 817015cb45ae75f936d5dd2be1e5f5fd SHA-1: 1a90a6020f13b8a528e650b504e6b2df4295f27b SHA-256: f9bf53511b6d07f247277bed09c1e466ee14b064babd805e975f86cadcb19f41

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads to a further stage of infection or phishing. No scripts were extracted, but the PDF structure and embedded links indicate a social engineering attack.

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/robux-free-codes-2021-game-hack In PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/coin-master-apk-hack_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/earn-robux-online_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/get-robux_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/how-to-wall-hack-in-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/minecraft-font-free_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/roblox-i-got-this-shirt-for-free_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/code-free-robux_GM431946152.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
- https://www.misceren.com/home/misceren/public_html/upload/files/free-roblox-fe-scripts-pastebin-july-2021_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
`font_00_sfnt_off000031cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31CF	23000 bytes
SHA-256: `f973407cca1b4333effa08c261d3df47e92b2b530bd358eaf74de461ef9fae60`
`font_01_sfnt_off00006564.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6564	19104 bytes
SHA-256: `064577b60cfb39f895675e184cf8184dbb2c01526f64d0c2beb4837be03beb32`

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