Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d51df77b7f4f968…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 02:27:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 42688670882f4bc0732aaf4babf1a4aa SHA-1: 21a565c5ffeb9c8fbb4dd97d65166c5ed7581e67 SHA-256: 9d51df77b7f4f9683cdc60ad8ad964060e5d312f8ee3f8a084fb75db4223c406
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks'. The primary lure URL is https://netcdn.tw/app/431946152/how-to-hack-in-roblox-dragon-ball-rage-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.tw/app/431946152/how-to-hack-in-roblox-dragon-ball-rage-game-hack In PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/robux-today-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-hack-into-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-hack-someones-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-with-developer-tools-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-noob-t-shirts-free_GM431946152.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_004_off000053ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53AD 27424 bytes
SHA-256: 0ecb1ab86861026b58f3323bfd271519895ce7679c57c40b267e42fcc712b389
font_01_sfnt_off00009201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9201 18800 bytes
SHA-256: f279f6acbc1ef9dd1e51c49ffbc146bf210c45cddbc1030d6547300680fb61f2

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