Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55f860326c80cae…

MALICIOUS

PDF

49.0 KB Created: 2021-05-12 09:03:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ad63106a5ddb0deb055a9aba56276067 SHA-1: c0e59ae01f97ec29ff87bb7ecfb39ef51e5b91b9 SHA-256: b55f860326c80cae7642bbbf3500b59f0db3989049a0db37ad37b68618f29bec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and potentially malicious files, disguised as 'free generator' or 'game hack' lures. The embedded URLs, such as 'https://netcdn.xyz/app/406889139/free-spins-coin-master-links-blogspot-game-hack', are indicative of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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/406889139/free-spins-coin-master-links-blogspot-game-hack In PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/free-coins_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_003_off00004fe8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE8 27668 bytes
SHA-256: 83ab59b059d61b787897308bd0cc382eef57900504dad39fc525906a9b4d7fa5
font_01_sfnt_off00008f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F71 3664 bytes
SHA-256: dec547a9e71fc2332f9dffd82a96910699159200d70b4a02eda9d322231ada6e
font_02_sfnt_off00009c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5B 18632 bytes
SHA-256: e19cb03e4db5dc0ff2825ab1b6cd29120edbbac4e5fd870bab1836bcb421f615

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