Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9af3804c453cb3…

MALICIOUS

PDF

42.0 KB Created: 2021-05-14 08:16:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f0e39169fa7e87645ba7914d639abdd SHA-1: 54997b702ea85094f394b5d4617f4a2106718b0a SHA-256: da9af3804c453cb3d65f1cca450a6ba3d597aef9c060485a4c00ea3f7b2102f5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that lead to pages offering game hacks and cheats, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely intended to drive traffic to malicious or deceptive content. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, possibly to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hack-coin-master-for-android-game-hack
    • https://www.devries-group.de/images/coin-master-tricks-and-hacks_GM406889139.pdf
    • https://www.devries-group.de/images/free-daily-spins-coin-master_GM406889139.pdf
    • https://www.devries-group.de/images/coin-master-free-spins-may-11-2021_GM406889139.pdf
    • https://www.devries-group.de/images/free-coin-master-hacks-no-verification_GM406889139.pdf
    • https://www.devries-group.de/images/roblox-login-hack_GM431946152.pdf
    • https://www.devries-group.de/images/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • https://www.devries-group.de/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • https://www.devries-group.de/images/websites-to-get-free-robux_GM431946152.pdf
    • https://www.devries-group.de/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • https://www.devries-group.de/images/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdf
    • https://www.devries-group.de/images/coin-master-apk-hacked-3526_GM406889139.pdf
    • https://www.devries-group.de/images/instagram-coin-master-free-spins_GM406889139.pdf
    • https://www.devries-group.de/images/1x1x1x1-roblox-id_GM431946152.pdf
    • https://www.devries-group.de/images/best-hacked-client_GM479516143.pdf
    • https://www.devries-group.de/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • https://www.devries-group.de/images/coin-master-free-link-facebook_GM406889139.pdf
    • https://www.devries-group.de/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://www.devries-group.de/images/minecraft-free-download-iphone_GM479516143.pdf
    • https://www.devries-group.de/images/best-minecraft-hacked-client_GM479516143.pdf
    • https://www.devries-group.de/images/coin-master-hack-download-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049bc.bin
fd17d815ee07aa16477a8c8aa244adfc12bb06e890e51deb4c2131cae2a4023a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BC 24644 bytes
font_01_sfnt_off00008296.bin
c73b8889e83ea4d6a092d9b03df5077e8a4a9cdf5eba30ec15891723340a0869
pdf-font-stream PDF embedded font (sfnt) at offset 0x8296 18056 bytes