PDF malware analysis — malicious · 83370f2b62f03d08

MALICIOUS

PDF

35.1 KB Created: 2021-07-20 01:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: ea710a868c143f9074b63235af2d97d9 SHA-1: 2b539140431577ac75ff144d1660a1ee437d3e16 SHA-256: 83370f2b62f03d08a5b9fa88bd570b3cdf125d98e66e650ce94f44e67939e1d3

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 'free spins'. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-app-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or scam attempt.

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/406889139/coin-master-free-spins-app-game-hack In PDF document text
- https://mycounty.com.ua/images/coin-master-hack_GM406889139.pdfIn PDF document text
- https://mycounty.com.ua/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
- https://mycounty.com.ua/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
- https://mycounty.com.ua/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
- https://mycounty.com.ua/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
- https://mycounty.com.ua/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
- https://mycounty.com.ua/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
- https://mycounty.com.ua/images/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
- https://mycounty.com.ua/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
- https://mycounty.com.ua/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.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_off000032c1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32C1	23856 bytes
SHA-256: `98745303b8bc876777adfe74243e3823cac6957000ffae009de63acfdd945a64`
`font_01_sfnt_off000068c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x68C2	17884 bytes
SHA-256: `21af4872a04c62c178ac31651a333ecdcea5bb1ed4ceeeef1956d42e8fc37ea8`

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