Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ba9f17b40bacc7…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 08:22:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8eba8593275840e9f993594cf7c09196 SHA-1: 238abad6d4fc4dd10fb5ff37a96abccabe4c95d2 SHA-256: 64ba9f17b40bacc7cd17b272250db1704d93f70d9595a67a136ef376edba48d7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game hacks or generators, but which redirect to malicious infrastructure. The primary redirector URL is https://netcdn.tw/app/431946152/free-robux-2021-no-scam-game-hack. The document body and embedded links suggest a phishing or scam attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/free-robux-2021-no-scam-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-u-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-cheat-codes-free_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
font_00_sfnt_off0000529c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x529C 26404 bytes
SHA-256: 9d5df7c3ef265846d525dbd68883f295a2d856c227e158c442209f99e105f86e
font_01_sfnt_off00008fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAE 18904 bytes
SHA-256: 74c8137d4740091300933bba9f79e39dc20465b83632d8cbe6c4f1d3e470c57f

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