PDF malware analysis — malicious · e96040989e88ea93

MALICIOUS

PDF

44.4 KB Created: 2021-05-11 15:31:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21

MD5: a87f005601c924bdbec66337ddf02306 SHA-1: e356eebe46736eefaca5e1e68e5c7cee333823ac SHA-256: e96040989e88ea93688765778a6fa79ece534180d1c1e966c2bae4174fb041fe

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering free game currency and hacks, indicating a social engineering lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' suggest these links lead to malicious infrastructure. The document body also contains a call-to-action phrase, reinforcing the lure to install a browser extension or viewer, which is a common method for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 6

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.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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/free-robux-without-downloading-apps-game-hack In PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/how-to-robux_GM431946152.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/robux-match_GM431946152.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
- https://wagstaffgroup.co.uk/media/storage/editor/files/coin-master-free-spins-apk-2021_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
`stream_003_off00004b6b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4B6B	26016 bytes
SHA-256: `5e8aaa429946d098a054674f2354f044afaedf5cf1ac2cb8bac23d808163961a`
`font_01_sfnt_off00008656.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8656	19876 bytes
SHA-256: `7dd9be13e4665f5a35086e4b23dd28e6d3ecc39135d95cb28b9ae9c86552181a`

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