Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9d0788da1231fd…

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 17:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c7565c70d85ee5b0f6d5a45d3f9f4154 SHA-1: 6d6274230ee9fd68e4f8c60bb629b6a81749732d SHA-256: 2e9d0788da1231fd2601e0ef1aba1862d0ecb2f0788cd39574d489d457877e4b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, masquerading as generators or hacks for popular games. It directs users to a malicious redirector infrastructure and a large link farm, likely to facilitate traffic redirection and potentially distribute further malware. The presence of a visual download button further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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 https://netcdn.xyz/app/479516143/how-to-download-minecraft-for-free-ios-game-hack In PDF document text
    • http://fobh.net/userfiles/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-com-2021_GM431946152.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_off00004ad9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD9 26156 bytes
SHA-256: 635bdf8aa4cd4b8bf859bad261134b90ebe29fb7b5a5d25feb2dfc76642ceb25
font_01_sfnt_off0000866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000901b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901B 18292 bytes
SHA-256: 6bfa7f6d06191d232a4e1dc6d24987c59b1603f32861b15c5e4613e2ba4a1bec

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