Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e649942bb4059ae…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 04:57:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fa7b525c4af3b0ad592fa80f71ca0c7b SHA-1: 5cea2d0fc4168ab6c8ec09c8bfd364f243039588 SHA-256: 1e649942bb4059aeb84604ab134b29829e975de40d3c1f5a009a3a1c25d32bbe
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a ClickFix paste-and-run lure. 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 6

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/minecraft-games-free-to-play-online-game-hack PDF link annotation
    • http://elibrary.smknesbu.sch.id/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pubg-uc-and-bp-hack_GM1330123889.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-generator_GM431946152.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
font_00_sfnt_off00005570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5570 25156 bytes
SHA-256: e30ba34fe2c3de22ae139b3e7260dd3ce8e27f40e7181027018f053714f70592
font_01_sfnt_off00008e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E28 18380 bytes
SHA-256: 979afcbcb5a2898064d94605cabe85d956bbe97e457aaa925e4cb72988a417e9

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