Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d5316594ed7a82…

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 11:38:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9bb73351ce31527956664e1a49fcedc4 SHA-1: 39bfecece297fd6b95b50aa3f17ccee6c12906a4 SHA-256: c9d5316594ed7a82bcd6f8ec61edde292c5c8097eb8cc79dd1c502590eaec2b5
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs social engineering tactics, specifically a 'game hack' lure, to trick users into clicking malicious links. The document contains numerous links to external PDFs hosted on `tnupacktour.com.tw` and a redirector on `netcdn.xyz`, likely serving as a gateway to malware or phishing content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 7

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/479516143/free-minecraft-skin-packs-game-hack PDF link annotation
    • https://tnupacktour.com.tw/image/data/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-unlimited-spin-link_GM406889139.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_003_off00004cac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CAC 25708 bytes
SHA-256: 562c99c64105c4c18b3ce2eeee29fee412d45018f511b2d196a7ffe2cf0671b0
font_01_sfnt_off000087b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B1 2824 bytes
SHA-256: 61b3a573627d4f03d30684157e1627da3b4499cefab0fdf17b45999135b0250b
font_02_sfnt_off00009158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9158 17892 bytes
SHA-256: 3d88f62d7f103248f07683485ae665a8ae7a7912bf87b287aa517b4ed8ad8cc7

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