Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb113a5ebe21b544…

MALICIOUS

PDF

35.4 KB Created: 2021-06-26 12:21:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 52d4e3fdd25b8d3ac8d324a87e5444ec SHA-1: 34799ef2255f013e587a7dc8950897533ef3530a SHA-256: fb113a5ebe21b5441ba1e4c1d28673081a0b8ceadc7fff78313b788c36e2585b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body explicitly mentions 'free robux' and 'game hack', indicating a lure to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.co/app/431946152/how-do-i-get-free-robux-on-iphone-game-hack In PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-girl-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/roblox-rape_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/wizard-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-twitter_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/roblox-free-hats-catalog_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-password-required_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-working_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/coin-master-cards_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-promo-codes-2021-october-roblox_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_off00003309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3309 22128 bytes
SHA-256: 01694040fdd96567c8b7634c10da269b1e68fc71ac9fc5b691ea841d87b1afd8
font_01_sfnt_off00006410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6410 19492 bytes
SHA-256: 66c10e85405198076a951fa92707604e0e3f9846185c5903b654d3312be3fd16

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