Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6989a93617009aa…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 22:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 53c6822dec657d810ac73d3b1d62ccdb SHA-1: abdde5d7d3513fde7eed8e72c9770fe4f6c77849 SHA-256: f6989a93617009aaecae08bbdb6c7966ee04c3a913c4883aa1b2b10d34ecb778
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 0.9865

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.online/app/431946152/free-robux-just-enter-username-and-password-game-hack PDF link annotation
    • http://library.yamasi.ac.id//repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hack-coin-master-8-ball-pool_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
stream_004_off00004f11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F11 24700 bytes
SHA-256: 180d55b8efaf4188a4bdd7e9e7106a28859576a742366f3cb51b96e2307f87cc
font_01_sfnt_off000087e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E1 19448 bytes
SHA-256: 4f9e120e202de6bc84ec177104ad4fa84abe9ff586f44aa7e03787aebbe4e81a

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