Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ffd7abd5d39741…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 08:35:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d07e6aa9beddae60bd04104734847a83 SHA-1: 9b19f977ea19ee870fe4d8c4ea5e1d77b28fa3d0 SHA-256: b5ffd7abd5d39741e0812e6e5803a18e6d48e7d959a6613693a0758de62d3b88
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. The primary link redirects to 'netcdn.tw', which is flagged as a malicious redirector. The document body and heuristics indicate a pattern of SEO link farming, with many links pointing to PDFs hosted on 'library.umla.ac.id' that also appear to be lures for in-game currency or hacks. No scripts were extracted, but the overall structure suggests a phishing or scam campaign leveraging deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/479516143/minecraft-bedrock-hacks-windows-10-game-hack In PDF document text
    • http://library.umla.ac.id/repository/free-robux-ico_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-hack-on-a-tablet_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-accounts-that-have-1-million-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-and-trading-group_GM406889139.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_off00003253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3253 23220 bytes
SHA-256: 769ba7d4a62eb8cbdaa3aff129f88fe53db3730e40d09ac711a631b6993df32d
font_01_sfnt_off0000665a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665A 19200 bytes
SHA-256: 92ba4d9be554fb736b9e7b1235b09796ba3046a264d1052683216498d49e4302

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