PDF malware analysis — malicious · 1140a3ef82c4bead

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 12:28:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: f0efe548e44c5b36391482a149f7b285 SHA-1: c809b052c9bbc844bb3f82bafe1dc8a0495ea196 SHA-256: 1140a3ef82c4beadd588f99dc916d5baafbe32a6574561eae0562f3d16aa589f

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on them, promising free in-game items or currency. The primary link redirects to known malicious infrastructure, indicating a phishing or scam attempt. The document body and heuristics confirm the presence of multiple SEO-optimized links pointing to external PDF files, likely part of a link farm designed to improve search engine rankings for malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-daily-free-spins-link-today-2021-free-game-hack In PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-free-roblox_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/comment-hacker-bird-simulator-dans-roblox_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-hack-kavra-rolplay_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-hack-pet-simulator_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/pubg-uc-generator-without-human-verification-2021_GM1330123889.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/cheating-on-someone-in-roblox_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/golden-chain-shirt-roblox-free_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-follow-a-player-everywhere-he-goes-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/free-roblox-redeem-codes-not-used_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-free-drawn_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
- https://www.kofordconverting.com/uploaded_files/userfiles/files/free-roblox-cards-youtube-live_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_off0000315e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x315E	22412 bytes
SHA-256: `79f0706754769442e01682a281ad30bfa5990f31f20730afd772e000fb4f955b`
`font_01_sfnt_off000062f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62F7	19344 bytes
SHA-256: `bda18ad7bc028b2989dfdc10c84b9c87c1dbf0242a88a3a6fbf9217f203e509c`

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