Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0b92d86fc13c69…

MALICIOUS

PDF

33.1 KB Created: 2021-07-02 03:01:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cc33799691e845a2a4d6c8603e29d135 SHA-1: 23158c9c9bf2031c1be56df7d50c14d496f12e8f SHA-256: ca0b92d86fc13c69c53b1ac7b042e4deebef76e101f56b4d3beffe165d104ee9
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 0.9824

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 http://netcdn.co/app/431946152/how-do-u-get-free-robux-on-roblox-2021-game-hack PDF link annotation
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-your-roblox-account-back-from-being-hacked_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-robux-on-laptop-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-free-stuff-on-roblox-that-cost-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/fly-hacks-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/hack-para-trails-simon-says-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/site-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/como-hackear-assassin-en-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/pastebincom-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/how-to-get-cinnamon-hair-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/infinite-fly-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-robux-promo-codes-2021-october_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/iro-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/free-25k-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fkg.unand.ac.id/repository/green-lego-cats-free-robux_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
font_00_sfnt_off00002b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2E 21728 bytes
SHA-256: 2ec8f9913e6f455ab96f7eac9fe2f6d293e3a490dd4e2c5cabcafeeb1ba3b9cc
font_01_sfnt_off00005ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB7 19628 bytes
SHA-256: 9ae61c19488d7fe68e3f972e98f21d5191fe12f15184de4901d20b3bd333c070

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