PDF malware analysis — malicious · 8610bdc1c510f88d

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 16:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 400893d720f9621084a4a10257cd477a SHA-1: 6b3230855f37dab284cb7edf1e1f8c90ec1b4233 SHA-256: 8610bdc1c510f88d9bd84f3c3dc7acdb9be6b01891e76cacf506d2041ebbada0

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links designed to lure users with promises of free in-game currency and hacks, impersonating brands like Microsoft. These links redirect to malicious infrastructure, specifically http://netcdn.tw/app/431946152/how-do-you-get-free-roblox-money-game-hack, which is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or scam campaign aimed at driving traffic to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 6

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.
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/431946152/how-do-you-get-free-roblox-money-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
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/how-do-you-get-free-roblox-money-game-hack In PDF document text
- https://pfpro.de/ckfinder/userfiles/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/robux-in_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/coin-master-gifts_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
- https://pfpro.de/ckfinder/userfiles/files/roblox-free-robux-website_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_off00003073.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3073	22340 bytes
SHA-256: `2791838b54b2cd770c84d3da206f45ea0b71f613fd3ecfb8fb9f8474d47dc604`
`font_01_sfnt_off0000625b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x625B	19764 bytes
SHA-256: `1ec372a20a2f657bbf737368fcc2e2ed2ffc6ad46e99235a1672347f31ef49de`

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