PDF malware analysis — malicious · 6bc05428cf1904b0

MALICIOUS

PDF

47.4 KB Created: 2021-06-08 22:21:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: cb7d984892a751016c3a6591c1723249 SHA-1: 252294b2c3ba7522bb6f17cf30fe01865c89a9e9 SHA-256: 6bc05428cf1904b08f760f410f4a2f33de9dde78d4d969eca78e3855257c8fb4

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and a callback-phone (TOAD) lure. The file 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 0.9769

Heuristics 6

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.
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: https://netcdn.tw/app/431946152/a-free-game-of-roblox-game-hack.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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.tw/app/431946152/a-free-game-of-roblox-game-hack PDF link annotation
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/roblox-download-free-android_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/roblox-admin-hack-2021_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/free-robux-codes-not-clickbait_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/if-roblox-was-free-part-2_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/rbx-free-robux_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/roblox-hack-2021-free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/how-to-make-everything-free-in-roblox_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/hack-de-roblox-jailbreak-descargar_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/cheat-engine-64-roblox-noclip_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/tiktok-free-views_GM835599320.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/golden-chain-shirt-roblox-free_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/roblox-ads-for-free_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/roblox-brown-free-hair_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/dbfa-hacked-roblox_GM431946152.pdfIn PDF document text
- https://www.ecegrants.on.ca/wp-content/uploads/fsqm-files/how-to-get-free-robux-codes_GM431946152.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_off00005078.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5078	25516 bytes
SHA-256: `583d1b756900a94be6840b1c41567edc38f13d41378ed5d4c8f5070659e39980`
`font_01_sfnt_off00008bfa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8BFA	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off000095e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x95E5	18436 bytes
SHA-256: `e2aef57822e0c895864108b5d3ecace9f192469910132e8236e3efdd7b5892ac`

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