Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73d24dd4f0f68f9…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 08:35:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5604256e080f7a7f1463b0d3ce199dd4 SHA-1: d76faa6e02ce3da4ed4f73a6312fdabe20166ea4 SHA-256: c73d24dd4f0f68f9ca1df692436fc16f00192a58433b75146802f7f8eb618a42
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body also contains the same malicious URL, reinforcing the lure. While no scripts were extracted, the PDF's structure and embedded links strongly suggest a phishing attempt to redirect users to a malicious site.

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/free-spins-coin-master-no-survey-game-hack In PDF document text
    • http://pustaka.fti.unand.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/cheat-engine-hack-roblox-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-hack-money-in-heists-beta-updates-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/blox-fun-info-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-white-pants-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-skin-tutorial-roblox-strucid_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-unlimited-spin-hack-apk_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_off0000313f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x313F 22604 bytes
SHA-256: 5daf7318858cf7dcc322e6156e5c7baf8d85a3d9d6d4a78fe4e76d768a3f0358
font_01_sfnt_off00006384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 18608 bytes
SHA-256: 680cafe8e4b1b393f295b34d6fcd5460ee3344c8993a72aaa8a95020f58f412b

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