Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dc8be7e244fe91…

MALICIOUS

PDF

41.2 KB Created: 2021-05-11 13:07:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cc570297a2dd300d6de6b19f3d5cb029 SHA-1: b536974c56f6b290b38ec64bf9ba058b82def299 SHA-256: 43dc8be7e244fe916fdb13fd4981a0f9374a2d951d1cddbb4bf7ba1e8373e0d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, specifically targeting users with lures related to game hacks and free currency generators. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-coins-game-hack In PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BA 24680 bytes
SHA-256: 04d94832197e8923baecf5cfd20c2dd75f6490edcc5e53625dd36a86f4829345
font_01_sfnt_off00008058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8058 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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