Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a71d40a0088e23f…

MALICIOUS

PDF

34.7 KB Created: 2021-06-25 17:38:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a12bfb28601ea79d08d2c794c9f11c29 SHA-1: c85c784a05ca81c0b1d8eece73139452a34b41ae SHA-256: 8a71d40a0088e23f35b843f68987fef89901d6b615537bc9ccbd0f4a39cdc91e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks and generators. These links lead to redirectors and a large number of other PDFs hosted on a repository site, indicating a link farm or SEO manipulation tactic. The primary malicious URL is http://netcdn.co/app/431946152/ghost-simulator-roblox-hacks-game-hack, which is flagged as a malicious redirector.

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.
  • 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/ghost-simulator-roblox-hacks-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/gamekitcom-free-800-robux-safe_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-robux-on-roblox-download_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/como-hackear-cuentas-de-roblox-espaol_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-vehicle-simulator-cheat-money_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/2021-how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-new-have-county-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-cs-go-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-for-real_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
font_00_sfnt_off00003000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3000 22260 bytes
SHA-256: 4eb7f55ef3a246bc68754e255f17a21122cfdfbbf7457cc6a5ee28d2b8b424d9
font_01_sfnt_off0000616c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 19444 bytes
SHA-256: f6cec36dd583ec72c2698733fc3decc0bb7caea37da30c736fdf35ed517fafa0

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