Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a31ca18c29bf0c…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 05:41:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9159f9a3a03797934acf00bfcb16bdb9 SHA-1: 06dfd7ddcf8406639cfe9ac49786fd1c2d2f8e94 SHA-256: 39a31ca18c29bf0c1c581947c440f6dcb7afd81888b39cc85e5c43d327d68e53
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.online/app/406889139/coin-master-free-gift-links-2021-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-hack-2021-december_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-legit_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_004_off00004f4f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F4F 26276 bytes
SHA-256: 2791171dbdf5988f898e6bf6a9825ccc0443750928cf24db81fd6c3f21fe0aff
font_01_sfnt_off000089f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F2 2824 bytes
SHA-256: a0d6c1ef1f7405ab05245801e4abbc2877925f97898db53811df9ab010e978fa
font_02_sfnt_off00009390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9390 18284 bytes
SHA-256: 00f588a17a5ec62cfb33c50734468f0ac7c021c7f981e3ddf1024eb2998eadd5

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