PDF malware analysis — malicious · 1c45b54f4384f192

MALICIOUS

PDF

33.2 KB Created: 2021-07-06 15:27:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16

MD5: 2fe0a134dd711ebbf4db3faac84133a3 SHA-1: ff5bc4e093737fbc25d667130228deb9de98badc SHA-256: 1c45b54f4384f192647975d089ef68f2415fdd0820104a3203b22b7f5af3afd9

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external sites, including a known malicious redirector at http://netcdn.tw/app/431946152/free-roblox-outfits-game-hack. It also hosts a large number of SEO-optimized PDF links on an external domain, suggesting a link farm designed to attract users searching for game cheats and currency. The document body and heuristics indicate a lure for free game items, likely leading to further malicious content or scams.

Machine Learning

Nyx PDF Classifier malicious score 0.9824

Heuristics 5

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.
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/431946152/free-roblox-outfits-game-hack In PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-and-no-ganerators_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-pastebin-hack_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/como-hackear-roblox-y-conseguir-robux_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-generator-no-survey-or-offers_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-gift-cards-code-for-robux_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-hack-ninja-legends-roblox_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-robux-2021-hack_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/minecraft-free-android_GM479516143.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-rare-roblox-account_GM431946152.pdfIn PDF document text
- http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links_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_off00002c5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2C5D	22012 bytes
SHA-256: `b7b4820ac8f8d8ffd03c3729950ed46cb14d2d85649de5a49221a80a2127a114`
`font_01_sfnt_off00005d28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D28	19012 bytes
SHA-256: `ec828579f1bf3ad39d511e6c27cfe71c9e7bfad388c36681936f0ec29ba6a95f`

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