PDF malware analysis — malicious · 307bb56fa3e391d1

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 09:40:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: c711b6bac8c28a5ea5e0998acb8de4ac SHA-1: aa01fecc2855196bdfb0f7b67d323c202437a168 SHA-256: 307bb56fa3e391d19fb2d37ae42f44da93f2d28f7b0dff946e9a269ef81dd12e

142 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. 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 0.9796

Heuristics 5

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.
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 https://netcdn.online/app/431946152/free-robux-generator-no-survey-no-download-no-human-verification-game-hack PDF link annotation
- http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/como-hackear-la-cuenta-de-alguien-en-roblox_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-tiktok-likes_GM835599320.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-4-tiktokcom_GM835599320.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
- http://www.biochemix.com/uploaded_files/userfiles/files/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000052c6.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x52C6	25272 bytes
SHA-256: `e5f3dd3e2af3261e1b4cca396f4380e43d69421f23e269055f546b914e26cb9f`
`font_01_sfnt_off00008da8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DA8	2880 bytes
SHA-256: `106de1d187d148d03f5c34a802444a7e62d93662ddf359d17cd55770c6c16081`
`font_02_sfnt_off00009799.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9799	19736 bytes
SHA-256: `3cea6d4f9da734904bcc55369e0b79f4621aa36195ab65246c463812034b9480`

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