Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9f8c71a9708bd8…

MALICIOUS

PDF

36.7 KB Created: 2021-06-18 14:19:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9c4b4c75a23316a203b637b00c6025b7 SHA-1: d1e5fa161e47460d2d0d2cde03f44713d8b6e1bf SHA-256: 3b9f8c71a9708bd8fb442b5eccc709ac80d2c9a8b39044a2ff8051fae1918ebb
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game items, such as 'Roblox Free Boombox Island' and 'Coin Master' cheats. These links likely serve as a lure to redirect users to malicious sites or download further malware. The presence of a malicious redirector link and a large number of SEO-optimized PDF links indicates a coordinated effort to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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.
  • 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-free-boombox-island-game-hack In PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-on-xbox-one-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-clothes-on-roblox-2021-mobile_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-promo-codes-valid-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-to-go-into-somenes-roblox-account-hack_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/moonactive-free-spins_GM406889139.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_off000038f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38F4 22448 bytes
SHA-256: a3217177575882ef0a8bc83a5ac7e6a3d63fb101ad90d06973c48c83d8ac717e
font_01_sfnt_off00006af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF3 18896 bytes
SHA-256: 8361150a3e5c745067de018221ef8fadbf22689120ee08049666ab64a92f7827

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