PDF malware analysis — malicious · cbea092571ebb914

MALICIOUS

PDF

35.5 KB Created: 2021-07-09 20:24:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21

MD5: c0a320e4ae8dadf1cd3c5cb974bba5c3 SHA-1: e729d2336408cd59f0e938cc3f9b1ac3f9a31057 SHA-256: cbea092571ebb914a66b35d3ab651257276455d03159c10b16e911bfa07b83fd

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a lure for credential phishing and potentially malware distribution, using game-related themes like 'Roblox' and 'free Robux'. It contains numerous links, including a primary malicious redirector at http://netcdn.tw/app/431946152/roblox36com-free-robux-game-hack, which impersonates brands like Microsoft. The document's structure and embedded links suggest it's part of a campaign to trick users into visiting malicious sites, likely leading to credential theft or further payload downloads.

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/roblox36com-free-robux-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/roblox36com-free-robux-game-hack In PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/when-you-get-hacked-on-roblox-rage-quit_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/coin-master-free-gold_GM406889139.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/roblox-free-no-sign-up_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/how-to-get-free-shirts-on-roblox-2021-no-bc_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/free-robux-codes-2021-list_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/free-robux-really_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/can-roblox-free-models-can-take-your-account_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/hackear-prison-life-roblox-2021-pc-dansploit_GM431946152.pdfIn PDF document text
- https://www.howard-avocats.com/assets/images/uploads/ckfinder/files/get-free-robux-easy_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_off0000327c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x327C	22600 bytes
SHA-256: `f0e30f0e49557530d221fe2e91af14abdac05c89cf3d426f0302c396c91a1072`
`font_01_sfnt_off0000649c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x649C	19392 bytes
SHA-256: `f5d8fb1e1227d04f94fc2588cf3bb8579c3297dc080a6331d916c9c738f57d9e`

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