Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43fce6a218d7012…

MALICIOUS

PDF

35.9 KB Created: 2021-07-04 20:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9ada533b203695794f9ff10c8be05cc9 SHA-1: 1f4643046deaf278a0d041f07b04143fee014368 SHA-256: b43fce6a218d70121a389119d64c0c6d9b2251acc7de7b1fa68c4ac75c9de1ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including one identified as a malicious redirector. The document body explicitly mentions 'Coin Master Free Spins And Coins Link Today' and 'game hack', indicating a lure for potentially unwanted or malicious content. The presence of a malicious redirector suggests an attempt to lead the user to a site that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-spins-and-coins-link-today-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-skin-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/www-inject-hack-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/wall-hack-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-t-shirt-template_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-redeem-codes-generator_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/download-roblox-for-free-on-mac_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/pastebin-free-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/black-t-shirt-free-roblox-tshirt_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/ultimate-roblox-hacking-robux-website_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-girl-hair-not-a-model_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
stream_002_off00003355.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3355 23444 bytes
SHA-256: f1ccb20af2dfc616485589a5b30546245a5accfdd51fd168332005ada02168c7
font_01_sfnt_off00006898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6898 18696 bytes
SHA-256: a6f9ee4f31e630697269259bd77ba9f20f050f36d84dfdb118abf4b75a264952

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