PDF malware analysis — malicious · 067c80591677d18c

MALICIOUS

PDF

34.2 KB Created: 2021-07-21 18:41:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 3ef5baf0f0ec0249bc9f664e31a0f8c1 SHA-1: 5260d49725d0e21640ebd21efdea2fb755a97dd4 SHA-256: 067c80591677d18c0c05ba7b2efbdccfa7508f89ab462ef7bd806f452eeb45e0

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spins-coin-master-2021-game-hack. The document body and embedded URLs suggest a phishing or scam attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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/free-spins-coin-master-2021-game-hack In PDF document text
- https://kierowcyhgv.uk/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
- https://kierowcyhgv.uk/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
- https://kierowcyhgv.uk/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://kierowcyhgv.uk/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
- https://kierowcyhgv.uk/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
- https://kierowcyhgv.uk/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
- https://kierowcyhgv.uk/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
- https://kierowcyhgv.uk/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
- https://kierowcyhgv.uk/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
- https://kierowcyhgv.uk/images/how-to-get-minecraft-dungeons-for-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
`stream_002_off00002f16.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2F16	23292 bytes
SHA-256: `a5af9d7de396b33605c4395fa6ff05a18dcc3136558486098f2b6f57602d179f`
`font_01_sfnt_off000063da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63DA	18288 bytes
SHA-256: `9732707b45c862b7a6ef8ea2418900def9be3650c6b325207d932644f64622ad`

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