Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac5880ab4524d4a…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 03:47:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ad3261984f54194c5da6e65ab780d62e SHA-1: 02ee9db6631c3d35581ed70312ad4cc1cf13918a SHA-256: 8ac5880ab4524d4a0ba3bebd6eb34ce3f27ecbe64514f80599ce8969d6d89298
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector service, disguised as 'game hacks' and 'free generators', which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm designed to attract traffic. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/freespinandcoin-game-hack In PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-today_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/synapse-roblox-exploit-free-download_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/cheating-software-ro-b-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_off000030aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AA 23192 bytes
SHA-256: d3779642ba68344f6c82068bd74c8bd69f3ffec4e9f0f2016ce24deced9883e8
font_01_sfnt_off000064da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DA 18244 bytes
SHA-256: 19494bed36003fadbe02431e250c62ef1698fa422030438aed600d934fd3a9e1

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