Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da9a46b59086165…

MALICIOUS

PDF

35.1 KB Created: 2021-06-30 07:09:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5d3781449fa2ebf3857c0ef2027883d4 SHA-1: 848d7fb4e63fd34ea83af60c326b7419f2730b00 SHA-256: 3da9a46b59086165ee73388baa4e6cc013775869a8b52a14f65e6c47cb58546c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to a redirector hosted on 'netcdn.co', which is flagged as malicious. The document body and embedded links suggest a lure for free game currency (Robux, Coin Master spins) or accounts, a common phishing tactic. The ML classifier also strongly indicated maliciousness.

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.co/app/431946152/free-robux-hack-no-inspect-and-element-game-hack In PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-no-sign-up-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/rich-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/e400-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-hack-no-survey-and-no-user-id_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-claim-generators_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-hack-apk-download_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
font_00_sfnt_off0000310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310A 22204 bytes
SHA-256: d726750a209b7554083064d822e7e6759ad924fffbeb2183575ba4397c2f52d9
font_01_sfnt_off0000624a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624A 19676 bytes
SHA-256: 7b20234fa6ef980081ded0646d76922cff03923529ddcb4a73e0af114fb7523c

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