Malicious PDF — malware analysis report

Static analysis result for SHA-256 2421a2fb7498487b…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 23:48:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 083958335bff92e654fb8eaf83bccad3 SHA-1: d45eb32579803a0102a33fb1acd9dd7102dfc86a SHA-256: 2421a2fb7498487b2171ed02b4d53cb4a43fda1e5c707e18cf3c3ece6e42ac50
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 0.9797

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/406889139/coin-master-free-link-game-hack PDF link annotation
    • http://e-library.smkn1jombang.sch.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-avatar-editor-free_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
stream_004_off00005049.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5049 24544 bytes
SHA-256: f80914dcf4fb226b5ea36a676fefc8fbc01882fd7845852899c05e53c5c87e11
font_01_sfnt_off000087c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C1 3204 bytes
SHA-256: b7fe42cb1da39e96c756399b3532633df029c1fbb3443b9e17d98df25c90dc65
font_02_sfnt_off000092c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C5 17880 bytes
SHA-256: 5ce88b684446e36e89a0643934549b22fce1d776877bbe9d9a558feafde7429d

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