Malicious PDF — malware analysis report

Static analysis result for SHA-256 306fda87d5483cd2…

MALICIOUS

PDF

46.4 KB Created: 2021-06-11 04:20:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8aa9e725324fbb869a4c2488e21d208f SHA-1: ccfc833e9e1f6d21b8258a23f738c670b357e20d SHA-256: 306fda87d5483cd2b9fd9679f96e098e92389ae87a9d74309918a68e14c0ad20
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game-related cheats. The document body and embedded links point to URLs designed to trick users into visiting potentially harmful sites. The presence of numerous external links suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/roblox-money-cheat-codes-rocitizens-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/pubg-uc-20219_GM1330123889.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/fre-de-fasility-en-roblox-manucrafting_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/best-hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-counter-blox-hack-2021_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_004_off000053e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53E1 26552 bytes
SHA-256: cbc5c61b765c28416337ee4d4968a31ea5704aefe8010079ab6c3924e038b2f3
font_01_sfnt_off00009052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9052 19036 bytes
SHA-256: 8fec158f7414804fd29c9de19914a372bf4cfa5106b1bec31311fd958e0c6535

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