PDF malware analysis — malicious · 42bf38ee8c87cdb4

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 03:52:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25

MD5: e09b18bb6e34929561b47a58f15db7a2 SHA-1: 4a156d00a2693634066bc72963603476d71766a7 SHA-256: 42bf38ee8c87cdb4e7540642b7bf4bc88ee8643203af5a9e078bdf81f4b0e4d5

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary lure URL is http://netcdn.tw/app/406889139/how-to-hack-coin-master-game-without-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely to download further malware or engage in scams.

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.tw/app/406889139/how-to-hack-coin-master-game-without-verification-game-hack In PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/roblox-injector-free-download_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/royal-high-school-roblox-how-to-get-free-money_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/bank-tycoon-roblox-cheat_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/uirbx-club-robux-hack_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/how-to-hack-the-roblox-website_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/krnl-download_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/roblox-robux-hack-no-servey_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/mad-city-cheat-roblox_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/master-coin-hack-apk_GM406889139.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/free-robux-generator-2021-no-scam_GM431946152.pdfIn PDF document text
- https://www.nationalmilklaboratories.co.uk/uploads/files/files/games-like-coin-master_GM406889139.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_off00003348.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3348	22600 bytes
SHA-256: `ff5d047a50ca993fe0062e9a39640b11f79e05d8bb617ae482c46c21937180d0`
`font_01_sfnt_off00006582.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6582	19064 bytes
SHA-256: `a8480d21748a50bcf9ac3d5cfbc0b0018be210baedebb5c1ff04cbf62fe825be`

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