Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c36fb195bcddca…

MALICIOUS

PDF

45.9 KB Created: 2021-05-12 16:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4abbc3c1c54bcf91b58e879651a9a876 SHA-1: b5f8acd80e0e13fddb3a3e9b88150e816bf0e06b SHA-256: b6c36fb195bcddcafee69264c32edd43a88f4ef008e394e2a13ae7f06f5ab587
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free game items and generators, aiming to redirect users to malicious infrastructure. The primary malicious URL identified is https://netcdn.xyz/app/406889139/free-spins-coins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interest in free game resources to lead them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/free-spins-coins-coin-master-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-money_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/does-roblox-premium-expire_GM431946152.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
stream_003_off000048bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48BC 28736 bytes
SHA-256: 9bfa2c2885021c590281a7e00d0e7612359194d070a65353163f1bf3308b0ebf
font_01_sfnt_off00008862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8862 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000924c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x924C 17884 bytes
SHA-256: 18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6

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