Malicious PDF — malware analysis report

Static analysis result for SHA-256 509b1abf63c91894…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 05:11:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 94a5d64f1ea10f55a72e946411935cd5 SHA-1: 877052584dae32eb24057d155cdad6ac8965939b SHA-256: 509b1abf63c918947169121899cd25e409f593093304d341d0358440ce94a4b1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, including a known malicious redirector at 'https://netcdn.online/app/406889139/coin-master-free-spins-16-04-19-game-hack'. It also features a link farm with 28 PDFs, many of which are related to game hacks and cheats, indicating a lure for potentially malicious downloads or further redirection. The document body, though partially corrupted, contains similar URLs and text related to game generators and free spins.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-spins-16-04-19-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D8 25788 bytes
SHA-256: f4f461e942d4595e0d307389f0aa9d98815275efa05312e132546d121aa6d9d0
font_01_sfnt_off00008c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C94 18560 bytes
SHA-256: a0bbfc082f98783fdd447455211163ff4a121f10355b931e3c7b5c7609f08a4a

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