Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b5887c0ee6fbb2…

MALICIOUS

PDF

43.4 KB Created: 2021-05-13 13:43:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 83728971dabc7dacb6898e5e86930321 SHA-1: 1fee0edb4281ec6bf78f7bb134babaac2ed1747b SHA-256: 03b5887c0ee6fbb2245cf5928823210e2575d9b07caf192832dddd23db709b85
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that are flagged as malicious redirectors, specifically promoting 'free Robux' or 'game hacks'. These links likely serve as a lure to download further malware or engage in credential harvesting. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • 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/431946152/how-to-get-free-robux-app-game-hack In PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-ml_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_off00004cb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB4 25240 bytes
SHA-256: 76fbc1d5ae0e277284bb6cff1a8dccffd096dccc76a6d6778ed0e796327f929c
font_01_sfnt_off000086a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A1 18460 bytes
SHA-256: 9b29575604d2c2a5900261a35c88052e604744084870fcd9fc708b4f32deccf1

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