Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc18e4eff2f5cf4…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 20:17:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ac9a7ca21eac5c12e7b86826d5cbcd11 SHA-1: 246f9fed66c6aff1f7031b08dacb6869b7127eb5 SHA-256: efc18e4eff2f5cf427e27b571b938266d81df50c71d3333d0172e663107b8f03
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating malicious redirector links and a lure for game hacks. It directs users to a URL that appears to be a redirector for free game generators, and also contains a large number of SEO-optimized links to other PDF files hosted on a repository domain. The document body itself contains the primary redirect URL and other related links, suggesting a phishing or scam attempt.

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.tw/app/406889139/free-spins-and-coins-coin-master-links-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-into-an-account-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-roblox-short-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-fre-codes_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-change-your-username-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/pokemon-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/ultimate-trolling-gui-roblox-download-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/elemental-battlegrounds-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/descargar-hack-para-roblox-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/como-hackear-roblox-para-tener-robux-gratis-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-no-generater_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-infinity-rpg-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-someone-roblox-account-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
font_00_sfnt_off000031a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A2 22848 bytes
SHA-256: c097889234e5e96e49349bfa74bff037b8dfd6092f685cf7ce2b544fffc1da12
font_01_sfnt_off000064cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CF 18520 bytes
SHA-256: 0611ff1470bbf14b410014ba84be5a7a1ba8d25e48472ec85a2f27b932274abb

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