PDF malware analysis — malicious · d638b1baa0fdf0fa

MALICIOUS

PDF

33.5 KB Created: 2021-07-20 00:50:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14

MD5: ea414f60fcf59121f7812c3bf9bb1711 SHA-1: cf086aef87e3274ab4760ecac497ce7ca2f01c4f SHA-256: d638b1baa0fdf0fa707f02521f9bab079234b7adba02bcc37d28fa757af91e39

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free in-game currency. These links ultimately lead to other malicious PDFs hosted on subdomains of 'omhelsjehart.nu'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded URLs clearly indicate a phishing or scam attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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.tw/app/431946152/how-to-hack-roblox-games-game-hack In PDF document text
- https://omhelsjehart.nu/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
- https://omhelsjehart.nu/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://omhelsjehart.nu/images/free-tiktok-followers_GM835599320.pdfIn PDF document text
- https://omhelsjehart.nu/images/minecraft-free-online-games_GM479516143.pdfIn PDF document text
- https://omhelsjehart.nu/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
- https://omhelsjehart.nu/images/tiktok-free-views_GM835599320.pdfIn PDF document text
- https://omhelsjehart.nu/images/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
- https://omhelsjehart.nu/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
- https://omhelsjehart.nu/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
- https://omhelsjehart.nu/images/minecraft-java-edition-download-free_GM479516143.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_off00002d77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2D77	22388 bytes
SHA-256: `99a6786e200406d9a406af3569e620097eca4c8995fe55cf03a9a6f62c7d2317`
`font_01_sfnt_off00005f36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F36	18792 bytes
SHA-256: `d2b3beaa7eaf02760ea0d23881cf6f3b718e872fdf4e4ab20a27c33912326b97`

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