PDF malware analysis — malicious · 7241f86f5492dbaf

MALICIOUS

PDF

35.9 KB Created: 2021-06-20 15:46:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: d326d72bb09a9ba6694082966cea2af9 SHA-1: 2a12968e6bc634939e494f8a30fd8efe10705b06 SHA-256: 7241f86f5492dbaf057d4b30203fc04177873edffd09584b5c1c2ccadec5a6eb

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution lure. 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.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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.co/app/431946152/roblox-adopt-me-free-pets-game-hack PDF link annotation
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-tshirt-roblox_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-executor_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-earning-sites_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-jailbreak-with-cmd-prompt_GM431946152.pdfIn PDF document text
- https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-time-speed-hack_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_off000033b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x33B5	22488 bytes
SHA-256: `3a09d0892a699ce810347fc8be986987e61a91cc08e52ea7a7e86c4d45560492`
`font_01_sfnt_off000065fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65FA	19452 bytes
SHA-256: `1dd96ab775d72901557935e6f5d2545c5806849eea1098932e8b85ef8c941c95`

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