Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f534d434b400a2c…

MALICIOUS

PDF

43.9 KB Created: 2021-05-14 13:09:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7498185e18bae4573a60391436f30276 SHA-1: af7d99fad6add29f53425701a5eaa786c77727df SHA-256: 6f534d434b400a2cb941865eafa5da93a2964de222c1f7fd50ad14fb88b8daa4
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 0.9969

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.xyz/app/406889139/free-spins-and-coins-on-coin-master-game-hack PDF link annotation
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/robux-link_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-free-box_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-with-no-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
stream_003_off00004f45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F45 25412 bytes
SHA-256: 18e03433af5ddb4a1db43c23e61dc967efeb8dd312670f60320c2e3e80e0281b
font_01_sfnt_off00008a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3B 18060 bytes
SHA-256: 64690fddacb88a1b87eb78a3bf181b542b813998c8d2539429c7660090ba79fa

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