Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13f35a673998ca1…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 05:33:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 51726eefbaa86253e71e79bb782067b9 SHA-1: 2aacc54b8db407e3d364977a0e022011ffca8971 SHA-256: a13f35a673998ca16fdef46d0ccb9e13f4d2b3fc6afc85672ef34d8c70d1944a
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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.tw/app/431946152/hack-on-western-frontier-roblox-game-hack PDF link annotation
    • https://digilib.stikesindramayu.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-candy-van-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-generator-com-hack_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
stream_004_off0000546e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x546E 25728 bytes
SHA-256: 30a4c44bd2d02f3c00b7696103ba379793ddb2221676dffbf0f2ca2974950232
font_01_sfnt_off00008e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E34 18768 bytes
SHA-256: 74eab9f2865e67794ae7430c95c4104eaf3d9a769fb29f3e0c3ed8378831c220

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