Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a61b29ee640f4a8…

MALICIOUS

PDF

49.9 KB Created: 2021-06-04 03:11:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: eaa9976f9757a52ab87d7a2d49a03c5c SHA-1: 3b09f43cf231c64a1fb8e8eb647618d2f37262ba SHA-256: 9a61b29ee640f4a875eb002da0ccad19eb397d788bff46ffe7de83db52479ebc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/431946152/free-exploits-for-roblox-game-hack PDF link annotation
    • http://digilib.stimata.ac.id/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/see-through-walls-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/to-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-images_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-links-2021_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
stream_004_off000050b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B2 28632 bytes
SHA-256: d1b01f031d7bf5aad7f68fffef12571b4b23658f8cbc7f725d34c73386111761
font_01_sfnt_off0000934a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA05C 18348 bytes
SHA-256: 3eb1125b3232d06dc8927376afe50af41f8c0a9e23720a9da0c3984e77695e12

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