PDF malware analysis — malicious · 2658d5bf3441a37b

MALICIOUS

PDF

34.5 KB Created: 2021-07-09 06:11:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: dcc67770ab195b73db29959226c9b270 SHA-1: dbc7c757a981129f43b77b0d5ff96a2eb4be68be SHA-256: 2658d5bf3441a37b7a1d3bec4910ae85a4e272f6df1120474a06fac3b9223199

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-free-blogspot-game-hack. This URL is presented as a 'free generator / game hack', indicating a social engineering lure to trick users into visiting potentially harmful sites. The presence of numerous other PDF links suggests a broad campaign distributing similar lures.

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/coin-master-free-blogspot-game-hack In PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/robux-fun-robux-hack_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-food-empire-money-hack_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-hacks-name_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-hack-atm-roblox_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-giving-group_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/tiktok-editor-free-download_GM835599320.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-meepcity-games-for-free_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/pubg-uc-deducted_GM1330123889.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-robux-with-cheat-engine-63_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-clothes_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-no-scam-no-hack_GM431946152.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_off000030ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30EE	22664 bytes
SHA-256: `bdbd7f0495659887a17bc25bb3bcf91fb37fcdbdc16eaa6fbd2dc141b274d34b`
`font_01_sfnt_off000063ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63AB	18464 bytes
SHA-256: `4ab065c9e1c1ce8cc0ca504291acf999189b22a872bad2ec3209c1b1ac2a7b96`

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