Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d23e79416327f0d…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 11:56:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dafd2e9b2b0799562f0a19e9dc0a3cff SHA-1: c8c8f1de7cf72c8385d0ef9db03173fdc254587e SHA-256: 1d23e79416327f0d9e05468ac7ceadd11b3e65cc47ba92afef892244261e3a5a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on 'free generator / game hack' lures. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL http://netcdn.tw/app/406889139/how-to-get-free-cards-in-coin-master-game-hack as belonging to known malicious redirector infrastructure. This suggests the document's purpose is to trick users into visiting this URL, which likely serves as a gateway to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-to-get-free-cards-in-coin-master-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/pubg-uc-or-g_GM1330123889.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hacking-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-free-robux-legit_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/creepy-hacker-roblox-face_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-roblox-to-get-rubuks_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-stuff-in-catalog-in-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/sandra-how-to-get-free-tiams-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000311c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x311C 22476 bytes
SHA-256: 260673e86e8cd2f73471c8bdcd5858e62c8327019aec1d2e7ab1ff1e93862e77
font_01_sfnt_off00006335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 18336 bytes
SHA-256: 0d5febb0e7f1fbd8a931d90606c69d40537333425eb6ed2519c796d1765588fc

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