Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb37f52415af876…

MALICIOUS

PDF

42.9 KB Created: 2021-06-04 01:42:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fd4a64c5cba8fca1f37d5e28078d6956 SHA-1: d10ef495953b080aec2ab9e088d175cda8b29f63 SHA-256: 2fb37f52415af8767c343db14b00bb1a98fb44291ad37590906b3db4022d1d38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users to a redirector URL, which is indicative of a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/free-spins-coins-coin-master-game-hack In PDF document text
    • http://lib.untad.ac.id//repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/wurst-client_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/my-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-rules_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/master-coin-master-free-spin_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_004_off00004e56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E56 24596 bytes
SHA-256: ba4198735213e07d4c4ab7c74a08f371c670c6c81cde9251ea4ee3a64d60c1e0
font_01_sfnt_off0000860a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860A 17884 bytes
SHA-256: 18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6

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