Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d99d5916245fab…

MALICIOUS

PDF

37.0 KB Created: 2021-06-26 12:43:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b605d3e072e396bbf59298c0586e279 SHA-1: 89cf691550897c0e417d19c0ffa43287fcb2afbd SHA-256: 76d99d5916245fab16a042b439ac0d47ea4b8fd2f96d97a691c0e75048c30eaf
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.co/app/431946152/how-to-get-the-right-roblox-account-pin-hack-game-hack PDF link annotation
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/my-roblox-account-has-beem-hacked_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/how-to-hack-awsomeeaglefox25-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/roblox-free-robux-legit_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/free-robux-easy-no-hack_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/how-do-i-hack-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/robux-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/javascript-roblox-hack-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/all-code-is-hacking-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/how-to-create-clan-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/free-robux-for-vids_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/kaio-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/free-robux-hack-org_GM431946152.pdfIn PDF document text
    • https://elearning.min3banyumas.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification_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
font_00_sfnt_off00003767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3767 22940 bytes
SHA-256: bed2e04e4a4144cc727d505e44bf8940a299a00c941953ad785f2c5a8a1bd301
font_01_sfnt_off00006a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A84 19504 bytes
SHA-256: 1d60d74143475577137311b1c15726b7b80ef4660ab3e9137f908ead2480254d

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