Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c4bd8953036db4…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 23:17:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 51a7dca001f96f795158a36b71fb5f7a SHA-1: 592a76dac5a12d642d44d5de37f16cc2503eac7b SHA-256: 87c4bd8953036db44bafa40f74e0c8f819d3e2580eeef1562c9bdd1e794c48be
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 free game hacks or generators. The primary link directs to a known malicious redirector infrastructure. The document body and embedded artifacts suggest a deceptive lure, likely intended to drive traffic to malicious sites or potentially download further payloads.

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/835599320/free-50-tiktok-views-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/pokemon-go-free-quiz_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/el-mejor-hack-para-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-into-accounts-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-cheap_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://hackernoon.com/tiktok-In 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_off000032cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CC 22508 bytes
SHA-256: e68d972cce2e1a96512ce8f7fe4cb46186c8cdfb5b561d55678d8bffb4512e3f
font_01_sfnt_off00006526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6526 18576 bytes
SHA-256: fba9a621b1f0e7c2ee5a1fd125b5aab39e77faa9b8693b6bc561bc991bdbe234

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