Malicious PDF — malware analysis report

Static analysis result for SHA-256 573c0de28e8c2ed3…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 10:29:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 08e2a5975e13d83161882da5748ecd3f SHA-1: 73014a085fceddb5c553284c78b578065d9479d6 SHA-256: 573c0de28e8c2ed38f54cc46fdc2c59dd58664d38f5d03b65eb5d1d093c0d275
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and currency. The document body and heuristics indicate a lure for users interested in such topics, likely leading to further malicious content or downloads. 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 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/431946152/robuxfree-con-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-play-roblox-hotel_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-roblox-para-tener-robux-en-telefono_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-bubblegum-simulator-cheats_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/block-best-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-speed-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/google-only-roblox-items-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/speed-hack-roblox-app-engine-64-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-generator-no-verification-2021_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_off00002fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE9 22916 bytes
SHA-256: 1ebab6a16774b6585aac4c1410b0c1f9e25344b0ee64ab406b7a28ea91251baa
font_01_sfnt_off00006388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6388 18552 bytes
SHA-256: 07f4ceef81295c64281aed857bd22deb8ed60983d578a01bf899a81815814d41

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