Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d664cfcbab2904…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 09:53:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5377111afcd21b0d0ec2d9cb3d13c48d SHA-1: 48334e424b1c62556c5e5c1955a5bc981d75a99e SHA-256: a6d664cfcbab2904f278f2a92af3c7cab4160c4c9bee528b1a4e3bed711a4817
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to potentially malicious websites, disguised as generators for game currency or hacks. The heuristic findings indicate these links point to known malicious redirectors and a large link farm, suggesting a phishing or scamming attempt. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a malicious intent to redirect users to harmful content.

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/431946152/how-do-you-get-free-roblox-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-meme-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-free-robux-download-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pokemon-go-free-1km-buddy_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-no-verification-2021_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_off000030b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B4 23060 bytes
SHA-256: 9843d07132e1bc5e0acfcd75755d0677623cdc30da36baf05a8ef6728b61e042
font_01_sfnt_off00006497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6497 19388 bytes
SHA-256: ad78cfc62cd8c1b058715f2dc66a6bf5ac5c09636f1ae08381e96b56faa7ef77

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