Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8fc3a7e4f53f73…

MALICIOUS

PDF

43.6 KB Created: 2021-05-10 23:01:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 93927a7bfcbb5d555c2a50cf1a56c851 SHA-1: e648b82652868f22a5c4a90a435de952faac4bc5 SHA-256: 2f8fc3a7e4f53f734f0bc0b711c2e8e710bd2074027b8749a5e9ef5f08f96249
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/431946152/how-you-get-free-robux-game-hack PDF link annotation
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/robux-redeem_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn4sda.sch.id/__statics/gudangsoal/files/oginject-co_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_003_off00004bac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAC 25696 bytes
SHA-256: ab91a4b610f73dc66757eda0c5a3ebe88adebd321c6689ffe9e38ab1ace7b9ba
font_01_sfnt_off000087af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AF 18444 bytes
SHA-256: d3aeb47c5138bb2f7afdc1cd1986e008461219f841fd4d3ae6acb877e9db5a0e

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