PDF malware analysis — malicious · 7af4c8a317728a38

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 21:58:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 383859a24562cc105e89d0cd57ae2910 SHA-1: ed5526e4dd09b20c0cbb300b43270068b82ecdac SHA-256: 7af4c8a317728a38e43beb5ea9ea0b71503b1ae046dd1ac24fd9420707e626d2

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 6

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.
PDF links to a 'free generator / game hack' redirector high 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.
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/835599320/free-tiktok-likes-and-followers-game-hack.
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
External URI info PDF_URI

PDF contains an external URL action
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/835599320/free-tiktok-likes-and-followers-game-hack PDF link annotation
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/rewardex-robux_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/cool-robux-hacks-lol_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-robux-website-no-verifcation_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/names-of-roblox-hack-scripts_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-robux-generator-tool-2021-roblox-robux-hack-robux_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-robux-urban420-network_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-roblox-games-for-guest_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/mcpe-client_GM479516143.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-free-game-free-to-play_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-tiktok-fans-quick-and-easy_GM835599320.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-cheat-codes-for-jailbreak_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/cheat-codes-vehicle-simulator-roblox_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_off00003331.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3331	22368 bytes
SHA-256: `e4eb33fd8bef7bbfb84b7b803403f91457c1ee5604ba1b471b1151dc2554088c`
`font_01_sfnt_off00006517.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6517	18384 bytes
SHA-256: `ffb8b5584dd90fb21d101e1fc15cc7794d94cd41a668197a564f5daa842824bf`

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