Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93c880af2abb84f…

MALICIOUS

PDF

43.8 KB Created: 2021-05-18 03:30:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 96e9588d6248d6d50e05f19056616b73 SHA-1: a485fb6a5a33fa4543d4c89571c1add9c8a98393 SHA-256: a93c880af2abb84f26e843816c1ca8c8af3008539655059d3e21822563d3ca5c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to a known malicious infrastructure, specifically advertising 'Coin Master Free Spins and Coins Generator'. The document body and heuristics indicate a lure for game hacks and generators, aiming to direct users to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/coin-master-free-spins-and-coins-generator-game-hack In PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-for-surveys_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-lukes-endon.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-march-2021_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
stream_003_off00004fb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB6 25040 bytes
SHA-256: 5939fb1eb748f90e26b6bb77f9495dbcac57ed664e8df65cfa7e9af0be55a4c7
font_01_sfnt_off0000897c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897C 18060 bytes
SHA-256: 5c936a158300bd644bf61cf1c4473900143af4d81ccb33b35f9f120089ba0cae