Malicious PDF — malware analysis report

Static analysis result for SHA-256 af133db0f3cbfba9…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 22:57:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4e6b1a6bf3ec85da3ebde86f45cd74d4 SHA-1: 5ffe6de7e2ef952ac3a7496953f96ebe761a21fa SHA-256: af133db0f3cbfba97e5daf485a29a22178c46d07fb771bb74aa7bdfc8e1f8aeb
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 0.9980

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 http://netcdn.tw/app/479516143/how-to-get-minecraft-for-free-on-android-device-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-roblox-deathrun_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-lua-scripts-for-cheat-engine_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/upload-audio-free-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spin-hack-coin-master-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_off000030ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AE 21640 bytes
SHA-256: 1731497a65e054d4bb7b454a70de731aa8a397cc99e873f6b83832b1b7e9f08f
font_01_sfnt_off00005fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 18616 bytes
SHA-256: 54a0671c03b3cf1f3bb53e1ad2af697eab54dc928557e8ed7be860ed48ff46e3

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