Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77c5b6611b7cf22…

MALICIOUS

PDF

44.6 KB Created: 2021-06-07 21:34:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a3dc431eff22b95cd2a8d8f11522bd03 SHA-1: 272bfb251afa813f40647169b5ac05760857fc78 SHA-256: f77c5b6611b7cf229c81e2e978aedd6250e439088b95429845664e518539847f
142 Risk Score

Malware Insights

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

This PDF document is designed as a lure, employing 'game hack' and 'free currency' themes to entice users. It contains a large number of external links, forming a link farm that redirects to other PDF documents, likely for SEO manipulation or further malicious redirection. The ML classifier strongly indicated maliciousness, and the structure suggests a multi-stage lure campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/well-hack-net-robux-game-hack PDF link annotation
    • http://sbm-nn.ru/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/pubg-uc-buy-in-pakistan-jazz-cash_GM1330123889.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/no-human-verification-coin-master-hack_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_off00005138.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5138 24844 bytes
SHA-256: 74c14bf685a484808643d3bfeee871785ebde3a3be3b6bffe722731c9428d0a4
font_01_sfnt_off00008a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 18624 bytes
SHA-256: 57581c33ec554c6bd184b9438e79e4f46b6a2339cf9beb515bf03ed92eebc0c6

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