Malicious PDF — malware analysis report

Static analysis result for SHA-256 449aed893f31b4c6…

MALICIOUS

PDF

48.1 KB Created: 2021-06-10 13:35:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 12141d64af91e05d9de9a57fffe7e0c1 SHA-1: be05eed4923dcc8bd8d552af0da461f0a23e7fa2 SHA-256: 449aed893f31b4c670ff6a4f44fbdd6185cb7f8d777751f08ec3d350abe80bd3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game currency or hacks. The primary lure URL is https://netcdn.tw/app/431946152/free-robux-without-an-app-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-without-an-app-game-hack In PDF document text
    • http://zercalo.org/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/easy-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-build-a-boat-for-treasure-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/hackear-roblox-para-android_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/link-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005057.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5057 26260 bytes
SHA-256: c8ddda3ff949fe69fa568dd574b8b6bc74f9836d9df071a3be2478aa85a9ad7a
font_01_sfnt_off00008cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB1 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000097db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97DB 18780 bytes
SHA-256: 1971add1034b08cbe21d58522ca5df77e1d3873bd8dcdaa217c5c052b3ecbc6e

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