PDF malware analysis — malicious · c68114a2c4979715

MALICIOUS

PDF

53.6 KB Created: 2021-05-16 17:12:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 1f53ad497c4b4879f521dd71754546b9 SHA-1: ab40759d364e06d309894d1d0d1e3a455815626f SHA-256: c68114a2c49797157df7f323f72b63120b2e60ef5b53b3df33cbb01a1aa9d58c

122 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. 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 0.9017

Heuristics 5

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.xyz/app/479516143/minecraft-pocket-edition-free-download-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
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.xyz/app/479516143/minecraft-pocket-edition-free-download-game-hack PDF link annotation
- https://www.astrospace.com.tw/upload/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/oprewards-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-minecraft-account-list_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
- https://education.minecraftIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00004c7b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4C7B	25216 bytes
SHA-256: `64db79ca438228f7f0a5cd7bf5a42e72268fa5ea76ccb659c95e07d3e31cbf03`
`font_01_sfnt_off000086a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x86A5	7936 bytes
SHA-256: `218d53b68bdddb064f6fba4be822d5b3725ed1cef1a3b42796a8dd99c4a62f4e`
`font_02_sfnt_off00009fce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9FCE	4232 bytes
SHA-256: `ab6320ab342704d2c5943abfba82ed4837bf2da871c91621741fd4cfd15c6ed5`
`font_03_sfnt_off0000ae5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE5A	18616 bytes
SHA-256: `74c3d0dac38db02fae044005a19145e6493ffdefda41676fc7dac63f0b05f007`

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