Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba452413519ea25…

MALICIOUS

PDF

45.5 KB Created: 2021-06-04 00:48:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ea9880b813cbe174a29edb1de304c7ce SHA-1: 45a2c284fe72d8358cf485130b2c1d0a1d7efc99 SHA-256: cba452413519ea253b3b26a99c02303c3827138bbd9583e01ad60a35aff21fab
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 0.9864

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/431946152/how-to-get-free-robux-without-doing-anything-2021-game-hack PDF link annotation
    • http://library.persadabunda.ac.id/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-links-for-today_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ff7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF7 25144 bytes
SHA-256: 0ab7762384aff6aa8a4dd75e16ec74be028ae69209bfc6c2ebd0ffea0ed181a2
font_01_sfnt_off00008a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 19804 bytes
SHA-256: 7de61e10f8b36a8651a25a8843179e8b1ecc4bebcf46d2f81f98618caa29dc1a

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