Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bef59b9faabd92…

MALICIOUS

PDF

46.0 KB Created: 2021-05-16 22:10:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8ba620a8b69ba3ca0201b66fed831a5e SHA-1: 0aaf8cc28db7f71cc3b0c97cb80afbdbbef65e44 SHA-256: a4bef59b9faabd92875523a8efff46a374365db32c0bfb81f7e330c83adc0b7c
200 Risk Score

Malware Insights

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

This PDF document employs a lure for free game currency and hacks, impersonating brands like Walmart to trick users into clicking malicious links. The embedded links redirect to known malicious infrastructure, suggesting an attempt to deliver a second-stage payload or conduct credential phishing. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to exploit user interest in free in-game items.

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: https://netcdn.xyz/app/431946152/how-to-get-free-robux-on-mobile-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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-on-mobile-game-hack In PDF document text
    • https://vodomery.kiev.ua:443/images/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/instantrobux_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/roblox-games-that-give-you-free-robux_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.

FilenameKindSourceSize
stream_003_off00004c08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C08 30304 bytes
SHA-256: 3d101a73789e3a38da1ee323c6735f7ba7a280c06038124f436cb78be541b812
font_01_sfnt_off000090de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90DE 18672 bytes
SHA-256: 54aa4755d3d4fcbd00d11f20b69d4376192dec0a97bdc1376cf216d73564a968

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