Malicious PDF — malware analysis report

Static analysis result for SHA-256 858d5ba54838c8f2…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 10:48:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3559ea134016e14be7e9501fb2cbf076 SHA-1: 186b71ad663a5197cdb4626cac2cbcdae859dc51 SHA-256: 858d5ba54838c8f2e63b065a55af291125c7fa36d912d7311a3688416b8c2b55
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 0.9769

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.online/app/479516143/how-to-get-minecraft-pocket-edition-for-free-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/pubg-uc-ykleme-kod_GM1330123889.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50CC 26696 bytes
SHA-256: 97bd9e5f96dad6935d745c1793a30bcd6f2cdedd0cb274b9d680d70972c550a3
font_01_sfnt_off00008cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB3 3092 bytes
SHA-256: 1aa0e4457f2fdbd20c643bc065edafaa683fd9dc2930c01c4492bce0fd9a7f02
font_02_sfnt_off0000975e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x975E 18372 bytes
SHA-256: 48146c158bc763bc875505d5b271c3d9491fcf22091c9e02863bb81ec9b852cb

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