Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3b1669bf020cf0…

MALICIOUS

PDF

45.8 KB Created: 2021-05-14 21:32:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a937837d1ccbfd1cf84ff5eac084d3e9 SHA-1: 221272f9cbdab5041fe919037fb561fb73ec5406 SHA-256: 7e3b1669bf020cf0ce7f2ba8edb2220b91bd6d7094786f35cd6ea2e5ae357d67
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 0.9628

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/431946152/free-robux-just-enter-username-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/free-robux-just-enter-username-game-hack PDF link annotation
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/get-me-robux_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.laxmansartemporium.com/uploaded_files/userfiles/files/free-minecraft-coins_GM479516143.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_off00004cc9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC9 24772 bytes
SHA-256: 12d3aaf5a0ee2c692f5c69550b7d8538af97f442744c7884472b5d11540914a9
font_01_sfnt_off000084a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A1 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E52 18960 bytes
SHA-256: ad194f5984d8cbd7c817d1b512f86f024f40bf30beebdf7d12c6ff62fc849400

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