Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad3e245c5ebc996…

MALICIOUS

PDF

48.2 KB Created: 2021-05-13 16:08:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bc8eed54f31524ca811803a41e55a468 SHA-1: 2b8cfb5e2fc40521ea3dd3615f07094f4c4cd87d SHA-256: 5ad3e245c5ebc9962b44fe1f970945d67154d21ebf24103b0c8ea9203d72c350
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF document contains a fake CAPTCHA and impersonates Facebook to lure users into clicking a link promising Robux for Roblox. This is a common tactic for credential phishing or scamming. The document also contains multiple embedded URLs, including one that redirects to a 'free generator / game hack' site, further supporting the malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/earn-robux-for-roblox-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/431946152/earn-robux-for-roblox-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/rbx-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/bloxpage-free-robux_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.

FilenameKindSourceSize
stream_003_off000047c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C6 29404 bytes
SHA-256: 0c72a8035be9fe2675a65be447270b7cd3e7e588c0b64ad6b0046e793495b25f
font_01_sfnt_off000089b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B0 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_02_sfnt_off000099ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99ED 18316 bytes
SHA-256: c0c60b14685fecf9466c28df4c763cf89eb547ddebc436478ad41afe4273dec9

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