Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1758ae58f892559…

MALICIOUS

PDF

48.3 KB Created: 2021-06-09 06:32:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7f76cdaf97b9ff5d25383947d9631897 SHA-1: d2ec8ed138a6b5bd9cfd6db9ca34367dc52a6b76 SHA-256: f1758ae58f892559891264e242c2c9e7803496fb984d1d9778035b24d9385f4e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, including one pointing to 'netcdn.tw', which is flagged as a malicious redirector. The document body and heuristics suggest a lure for 'free Robux' or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the presence of malicious redirectors and the lure indicate an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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/431946152/10-million-free-robux-game-hack In PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-robux-not-a-scam_GM431946152.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_off000051a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A8 26980 bytes
SHA-256: 2f58d44d16f11f582cbe31ffb1b65b89c1464c2bc9f0d07edd64bc684e5d3d84
font_01_sfnt_off00008f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F61 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00009923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9923 18684 bytes
SHA-256: 94a37a3deaf5364fbfcfa89855d7f0ed66684272f9349e21e246b8513ba6fef8

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