Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcae30b88f553506…

MALICIOUS

PDF

34.7 KB Created: 2021-06-24 06:34:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cf635674978a159618ffb4a24f4b93f9 SHA-1: 78da4057e9a66e83a89292538898143b4afce9d0 SHA-256: dcae30b88f55350636bd78e04851b7943d29e2b915259f6210239ae2df61030f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'game hacks' and 'free Robux'. The heuristic firings indicate this is a credential phishing lure impersonating brands like DHL, directing users to a known malicious redirector. No scripts were extracted, but the embedded URLs and document content strongly suggest a social engineering attack designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.co/app/431946152/roblox-hack-somones-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.co/app/431946152/roblox-hack-somones-robux-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-hack-someone-password-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/i-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-1-million_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/irobux-fun-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/can-pokemon-go-free-coins_GM1094591345.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.

FilenameKindSourceSize
font_00_sfnt_off00003047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3047 22588 bytes
SHA-256: 19ed0e409954d30822aad6fcea9c22604d2adb40d36752bc94daac447b73dc1b
font_01_sfnt_off000062ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AC 19056 bytes
SHA-256: cf0aabb4855605b8b5d3e91ad8696e58c217a26ee66563ae9b8ae8732fba8a5b

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