Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cd730db13a04a1…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 20:26:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3dc1db43a42b1e1534f6094c54a468e2 SHA-1: 694b235a2b728ba3e78b68e621425d7f75a26544 SHA-256: 87cd730db13a04a173f56ca64d76d1c4094d6e7f4b3b94b17c4d0866ec221d7f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on them by promising free in-game currency or hacks. The primary link, http://netcdn.co/app/431946152/get-free-robux-easy-game-hack, is identified as a malicious redirector. The document body and embedded URLs strongly suggest a social engineering tactic to drive traffic to potentially malicious websites.

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/get-free-robux-easy-game-hack In PDF document text
    • https://smark.com.tw/image/data/files/free-roblox-pants-girl_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/como-tener-mucho-dinero-en-jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/oprewards-com-login_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-gift-codes_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-games-that-actually-work-robu_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/is-there-a-way-to-get-free-pokeballs-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/this-app-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-roebucks_GM431946152.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_off00002e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9D 22772 bytes
SHA-256: fd0496f978fdf20af2676a3f61135b3be106306604ddee28c5ad80eb7a0ce5ff
font_01_sfnt_off00006173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6173 19000 bytes
SHA-256: 7fe4e2051db96b3be16003decc0da2985784f90e54de2612d38c848f400969e9

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