PDF malware analysis — malicious · 244d9f404516fd2e

MALICIOUS

PDF

35.0 KB Created: 2021-07-22 05:43:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: cfe0d34ce8407e39bb1e39f7faec1357 SHA-1: 655ea6c4aeacc4b64a56d42fb3ac7d6ace2a3533 SHA-256: 244d9f404516fd2e2bb6290706fe0ef428b83d08e3ef3b8344a1cc9fa9dc4e28

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/how-to-get-free-robux-without-human-verification-game-hack. The document body and heuristics indicate a lure for free game currency or hacks, which is a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9962

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-get-free-robux-without-human-verification-game-hack In PDF document text
- https://www.herbasacra.gr/images/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
- https://www.herbasacra.gr/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.herbasacra.gr/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
- https://www.herbasacra.gr/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.herbasacra.gr/images/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
- https://www.herbasacra.gr/images/free-tiktok-views_GM835599320.pdfIn PDF document text
- https://www.herbasacra.gr/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
- https://www.herbasacra.gr/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.herbasacra.gr/images/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
- https://www.herbasacra.gr/images/how-to-get-free-robux-for-kids_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_off00002e12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2E12	23512 bytes
SHA-256: `ba66ede5811b137f0c212e3a39e9af5be3d8183804213337080d47ba3a55e8d4`
`font_01_sfnt_off0000631b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x631B	19576 bytes
SHA-256: `d6c196fa7de21508bf6b3e678e512c9fb9da877bdd87245515b69efbbf320e55`

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