Malicious PDF — malware analysis report

Static analysis result for SHA-256 1306cfa221e0dd58…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 06:19:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e498ec5fde837a059d6cbb2d325a145b SHA-1: c954c4238ef964731213a8ebc92a72da1dfc8bed SHA-256: 1306cfa221e0dd58dc30e687c4b97be426a90f6fcb5c4153ef7e4ca36fa94e30
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and free in-game currency. The ML classifier also flagged this PDF as malicious. The primary lure appears to be related to Roblox and Minecraft, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/roblox-hack-como-tener-roboux-gratis-en-roblox-game-hack In PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/instant-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/pokemon-go-free-items-code_GM1094591345.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-fan-page-free-spins_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
stream_004_off0000547d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x547D 24504 bytes
SHA-256: 57ccbe95967cfbc8f2ed69db0d6094f4b80851e012688ae75f39794718260d69
font_01_sfnt_off00008c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5C 19008 bytes
SHA-256: 2ecc9b6919122945ceaec4519844970bb811ea8a4f73417094870146415fd46b

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