Malicious PDF — malware analysis report

Static analysis result for SHA-256 785c0b018496dd2a…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 12:46:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 22bea14aa302c33c9195dade2daead34 SHA-1: d64f6599670fc1906353ec9847d843f0ae08c037 SHA-256: 785c0b018496dd2aadc0579e2b3cecc4c07f00b8780930c668e04ae5dc79d192
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a malformed stream and links to known malicious redirector infrastructure. The primary lure appears to be a "free generator / game hack" which redirects to the URL https://netcdn.online/app/406889139/daily-coin-master-spins-game-hack. The document body, though truncated and obfuscated, contains references to similar lures and embedded URLs, suggesting an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/daily-coin-master-spins-game-hack In PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/roblox-gang_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/pokemon-go-3-free-raid-passes_GM1094591345.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-websites-2021_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_off000050e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E6 24636 bytes
SHA-256: 33e991a4987885dd929b9f9d2853cef7bc989af15dbb1f3dfc5c957232bfd38d
font_01_sfnt_off00008944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8944 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000932e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x932E 18144 bytes
SHA-256: bc10b16e761ad325a331543066bfce6b0ff34f70478a358edc53294c2ec73427