Malicious PDF — malware analysis report

Static analysis result for SHA-256 863bbf5673d7a687…

MALICIOUS

PDF

46.9 KB Created: 2021-05-20 00:02:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3d26a0462ea4f5876120abf922dc1242 SHA-1: 56b5cbc33b0b24551a1c2c775c241a32a8760420 SHA-256: 863bbf5673d7a687838c78320317cae30b52effd64c3d7db9a79ea8870f5e871
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to SEO-optimized PDFs on the 'elite-house.su' domain, designed to lure users with promises of game hacks and free currency. One initial URL, 'https://netcdn.xyz/app/431946152/robux-no-survey-game-hack', also appears to be part of this redirection chain. The document body, though heavily obfuscated, contains references to these lures and the authoring application, suggesting a malicious intent to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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/robux-no-survey-game-hack PDF link annotation
    • https://elite-house.su/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/robuxfree-con_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-free-spins-today-daily-links_GM406889139.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_off00004b4f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B4F 26216 bytes
SHA-256: 459864b988f3ff1483700df18e432bc2ef91634f07e0970ff4a1db200f7b8e44
font_01_sfnt_off00008851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8851 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000094f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F9 18144 bytes
SHA-256: 51c7a9de4a3a273f6fa8ac7622f19aef511f410b3317fdbb853ddd1ab61a3972

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