Malicious PDF — malware analysis report

Static analysis result for SHA-256 a339ab9dcfe0f044…

MALICIOUS

PDF

37.7 KB Created: 2021-07-03 19:39:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fb2aca33679e843233b713beb55862da SHA-1: b4c1fb5229488b162ad72acbce16d376d2dfe914 SHA-256: a339ab9dcfe0f044d3c48ac5d77219b943755a2d77aee451ee301cc96a8afa15
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or downloads. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.tw/app/406889139/coin-master-free-spins-april-2021-game-hack In PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/cheat-block-piece-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/download-app-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-hack-pastebin-2021-flying-script_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-geaar-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-do-you-get-free-tix-and-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/roblox-free-robux-codes-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-instant-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/bad-business-cheat-roblox-tuto_GM431946152.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_002_off000030ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30EA 23144 bytes
SHA-256: c2211d90d2a423f6cd80be3832c64852cb4d63f49b37b3e8cce1a10bb2a3104e
font_01_sfnt_off00006549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6549 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2E 18652 bytes
SHA-256: f450b6131960b2f2530361d55bff5afbccc3746f58132bfdde4257a36559d8a2

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