Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6c1f656bb7b9c8…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 02:09:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e7c718fe148f3ca1191baf3c23a0137d SHA-1: d9e306dab0c765cc5823ec60e62226f752baf80f SHA-256: 7f6c1f656bb7b9c8bc7c1cc75dfbc0eb87d08534bba798a5427aa56790c71540
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 0.9980

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.xyz/app/479516143/minecraft-life-hacks-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-free-gift-card-org-hack_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_003_off00004c5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C5C 30008 bytes
SHA-256: 903dba4ca91a4fa15514fa394de8d2ec3bd94adabc5ee0459cee81e7b1fd4414
font_01_sfnt_off00008e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E77 17740 bytes
SHA-256: a9f228f82f523f82f2ec29969fa693daed0cd9273bc8dad9e6ca4184f04ba0fe

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