Malicious PDF — malware analysis report

Static analysis result for SHA-256 f296f81ca6f1bd82…

MALICIOUS

PDF

45.4 KB Created: 2021-05-10 16:18:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fe87648172939991cb1deeb3f5ab337c SHA-1: aabf2fe92a7b0f533b2029ec452285f14087f9c6 SHA-256: f296f81ca6f1bd826e19febc5575903367fcdd5c14e7f1f4fd68fecc5d2e1940
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 0.9507

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/479516143/minecraft-ps4-free-game-hack PDF link annotation
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/getrobux-info_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnkampak.sch.id/__statics/gudangsoal/files/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8C 25276 bytes
SHA-256: eef21c681381d498ad07748c465bc8cc81771790d13993c28bd4794700a6c4c0
font_01_sfnt_off000086a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A2 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000090b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B2 17784 bytes
SHA-256: eb08404513e1de89cb797b3c4bca4c8ebf2d802e230ebef8911427dd20e63131

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