Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1974fd784149a53…

MALICIOUS

PDF

48.2 KB Created: 2021-06-09 15:35:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 435fa0033015b7ad8748cdc4d8b730b2 SHA-1: 093d3e96764d9afa933d23e718f46c2a5bd38639 SHA-256: b1974fd784149a53f494ea0652b8160ed906dd4ea85c68984eb9a7dbb635bb2e
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators, indicating a lure-based attack. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into performing an action, likely to download or execute further malicious content. The document body and extracted URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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/roblox-jailbreak-hack-pay-game-hack In PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-super-hero-life-cheats_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/hackear-roblox-sin-inspeccionar_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/hack-roblox-online-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-free-robux-not-a-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/rewardex-robux_GM431946152.pdfIn PDF document text
    • https://direct-link.netIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005083.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5083 24844 bytes
SHA-256: 0503687bbebbd525fdb05233bdeb622ecbca257a151bce4da3a423b367a69f78
font_01_sfnt_off00008971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8971 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off000097fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97FC 18804 bytes
SHA-256: 3c9fc3ab3ac625668700f5bf80bb7127b0ad04a67dea3e40cdeb56a42e2aa0dc

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