Malicious PDF — malware analysis report

Static analysis result for SHA-256 758b96227d41787e…

MALICIOUS

PDF

35.6 KB Created: 2021-07-09 05:29:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f363aa0c3e578ffb080fb120ba267ba6 SHA-1: 34dd7f3cc972231b490004267e830a4f53fa5c7f SHA-256: 758b96227d41787e7c25d84f730a5fae637fc96d3c92c26ffbcefdac342b4749
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/406889139/coin-master-free-daily-spins-and-coins-game-hack PDF link annotation
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-roblox-short-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/mistplay-hack-robux_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/roblox-hack-scripts-for-children_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-robux-games-on-roblox-link_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-roblox-gift-card-codes-2021-november_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-robux-no-saving_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-to-get-admin-with-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-to-hack-roblox-for-robux-2021_GM431946152.pdfIn PDF document text
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/cute-drawings-roblox-for-free_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_off000033e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E1 22840 bytes
SHA-256: 6d6b5b28547a5cd8f0e094f72ba48f30edc084ba12dd21554e178a9a8b9b8534
font_01_sfnt_off000066f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F3 18772 bytes
SHA-256: f3f8fa3a6eece84f4896eed170bca3035b504aefd00cdbf459e31d86686c87b4

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