Malicious PDF — malware analysis report

Static analysis result for SHA-256 294f7c4a9de2bb7a…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 11:56:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a43f4bba500344189e3db01b07ac9a12 SHA-1: 871dd06491fafee0d3f559f826fa804fc433681e SHA-256: 294f7c4a9de2bb7ab4170cdc1512834087a60212badcda76e73caed18c461232
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on "free generator / game hack" content, which are likely part of a phishing or scam campaign. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malware. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/crazy-robux-free-robux-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/synapse-x-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/tiktok-free-make-your-day_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/april-fools-hack-roblox-wiki_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/cheat-roblox-jailbreak-glitches_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/code-for-naruto-roblox-free-spins_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-any-roblox-account-using-windows-command-prompt_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-robux-windows-10_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-do-i-get-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_off00002f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1C 22704 bytes
SHA-256: 0118931cca70b3f80a2c1f0af1b0c1347c423967ca454e5e74bdd23737b4ba61
font_01_sfnt_off000061ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AC 18980 bytes
SHA-256: 5f676f777cbd8083d4ae89ee4532bbed66f69a4e907b4942d42aa81c871b9672

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