Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f07d9f6eadb4bb9…

MALICIOUS

PDF

48.9 KB Created: 2021-06-08 08:30:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 429c695cf399070c9e63dc7a659c8cc5 SHA-1: 953ca38b57c95a23a91669085a55c74fcb9ab6a2 SHA-256: 9f07d9f6eadb4bb9fbd4b00c3a52a822ad23004fbb5fa76ee6cf58240908c93e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The primary link, https://netcdn.tw/app/431946152/free-robux-promo-codes-2021-game-hack, is identified as a malicious redirector. The document body and heuristics confirm a lure-based attack pattern designed to entice users to click through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/free-robux-promo-codes-2021-game-hack In PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coun-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-become-pubg-uc-seller_GM1330123889.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/pubg-uc-980_GM1330123889.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-online-hack_GM406889139.pdfIn 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
font_00_sfnt_off0000517f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x517F 26072 bytes
SHA-256: cae110d74eef91b9dfd4fda03e9e393d3de66b4fa52dc6a9fca00868f223c170
font_01_sfnt_off00008dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC6 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6E 19004 bytes
SHA-256: 2ae4233163b81a205a597c97f5f9bceef85a21038461a0399da8d1b6d9f39b0a

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