Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2afa944b8233818…

MALICIOUS

PDF

47.6 KB Created: 2021-06-08 11:21:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ddcc597d44312c758a49488d68667877 SHA-1: 7df4c80fd5c7ee6aca540267462ea73dd509df93 SHA-256: d2afa944b82338181dc9205bf621102ca6c369bb4b81ca1f55a595c2670eb053
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links designed to lure users into clicking on a generator for game currency, which redirects to known malicious infrastructure. The ML classifier also flagged this PDF as malicious. The embedded URLs and the lure text suggest a phishing or scam attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/robux-para-roblox-gratis-hack-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/get-coins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coinmaster_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.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_off000050fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FD 25764 bytes
SHA-256: 260999eb6ea1c6fd5c020b2094dd057925ff0811265ae45fe441673bc6a096fc
font_01_sfnt_off00008c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C15 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9600 18700 bytes
SHA-256: 8823445274cf05f223d3872c093040e6ee60fe4ed86dc9f97759fc01c4a66641

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