PDF malware analysis — malicious · 4cf637f4888a5dc9

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 19:07:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27

MD5: ccfa156a442647c128d2597d25d0bf69 SHA-1: 593ca0ec00c0efc706bc3ed3e1fd25bca566a6b1 SHA-256: 4cf637f4888a5dc92ce86dc5eaba1978099f4c241d9cbdb22578ffbb9e6c87b4

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirectors and lures for "free generator" or "game hack" content. The heuristic firings indicate that the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure itself facilitates these malicious links, suggesting an intent to lead users to phishing or malware download sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9432

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 https://netcdn.xyz/app/431946152/how-to-get-free-roblox-game-hack In PDF document text
- https://vosco.vn/uploads/vosco.vn/files/robux-place-rewards_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/get-free-roblox_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/link-coin-master_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/roblox-com-hack_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
- https://vosco.vn/uploads/vosco.vn/files/minecraft-hack-mod_GM479516143.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_003_off0000483a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x483A	25552 bytes
SHA-256: `aa7a4673c7d93937f8836c2acb6fa983b5752af8b2e91f167655391fc2754856`
`font_01_sfnt_off0000832e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x832E	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off00009040.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9040	18216 bytes
SHA-256: `4bd910cbe6e13e3cc1fd56827474962a0b5b839547430a6bf478c6dff96655e9`

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