Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba194344b3531b1…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 11:33:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4f6c66aed66061bcfd5ca8b89ba38f12 SHA-1: aa9652f6b44fcca6880117a6e1e2e67698fc0af7 SHA-256: 4ba194344b3531b1c2fe8456d624a6901e028bede692d6cec0d4a3e8a937a4b3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a lure, employing tactics to trick users into clicking links for game hacks and free currency. It contains numerous links to redirector infrastructure and SEO link farms, which likely serve as a distribution mechanism for further malicious content. The presence of multiple critical heuristic firings related to malicious redirectors and link farms strongly indicates a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/406889139/coin-master-daily-free-spins-link-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-in-alternate-route_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-hair-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-hack-to-get-infinite-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/thanos-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/best-hacks-for-frappe-roblox_GM431946152.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
font_00_sfnt_off00003186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3186 22688 bytes
SHA-256: 2425956947a7779a925e3517e7e7f043486df08e458a818304c7a58c145b3b3f
font_01_sfnt_off00006458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 18768 bytes
SHA-256: 989ac8744b1238afa99b88b7bb3fb2df9d299a986309a52cf516f5921eb03fc0

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