Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88925a1f485f155…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 12:10:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 61bcef641ea92edbe178ddaa1a293108 SHA-1: 8925672f9d0a73298c76bf03a44736e954dde02a SHA-256: a88925a1f485f1553b203a4c6b546b5a858c5c05cc5c67771e35a503b5d4210a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a 'free generator / game hack' for Minecraft, which is a common lure for malicious redirects. The document body and heuristics confirm the presence of links pointing to known malicious redirector infrastructure. The primary URL identified is http://netcdn.tw/app/479516143/how-to-get-minecraft-java-edition-for-free-game-hack, which is associated with a game hack lure.

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/479516143/how-to-get-minecraft-java-edition-for-free-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-codes-youtube_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-retail-tycoon-cheats-xbox-one_GM431946152.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/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pokemon-go-free-app-download_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pokemon-go-free-download-version_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/counter-blox-roblox-offensive-hack-script_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/2021-robux-hack-inspect-element_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-import-audio-free-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-gift-card-codes_GM431946152.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/how-to-use-skidama-level-7-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-apk_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_off000031d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D1 22492 bytes
SHA-256: a8e88ac534c5088f904ec877093ffa7e13511a2faa58e276b14757529e728fc1
font_01_sfnt_off00006385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 18616 bytes
SHA-256: 898c1194d8bc2e07c8eea0e55d341ba96b7c540544d1d7788b8098c3180d6029

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