Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85b4eaa6897486a…

MALICIOUS

PDF

46.6 KB Created: 2021-06-04 01:13:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c585df03c441bf134c3dba58d2478413 SHA-1: 69d85722cc46c1a5e2be286faface08be463e779 SHA-256: c85b4eaa6897486a44c1b16eb541bca6a4e3fb47a7d4f96e58229756c11f1555
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links that redirect to a malicious domain, masquerading as a "game hack" generator. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into visiting a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/coin-master-free-cards-link-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/10000-robux-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-but_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-coin-master-spin-and-coin-link_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_004_off000051d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D4 24888 bytes
SHA-256: 1103261904c8d48187d7588fc7920072e679da39eed03064fd7fad0e85891737
font_01_sfnt_off00008a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A60 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9412 18056 bytes
SHA-256: 4c00fba11e6222d30ce91962ad0846eff86227a46da4e4704094e367f0981575

Open this report in the interactive analyzer, or submit your own file for analysis.