Malicious PDF — malware analysis report

Static analysis result for SHA-256 958ff8dd32e7acd7…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 18:24:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3b15a8b7d8318c2835e3156ff469b4c5 SHA-1: c0a9a3dce513a030d08c58a85ddcb8da2ad0cd5b SHA-256: 958ff8dd32e7acd7901ac8b8db7744f923cc6cfab2ed1ef199cdf88774cc5a9b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to malicious redirectors and SEO link farms, primarily offering 'free Robux' or game hacks. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-for-kids-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

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/431946152/free-robux-for-kids-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/can-i-get-free-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pokemon-go-free-event-box_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-free-robux-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-ghost-simulator-infinite-money-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-shirts-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-daily-free-spins-link-facebook_GM406889139.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_off00002db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB8 22040 bytes
SHA-256: f497eae8bddf049d53a3174ea3901b80fa200eca72919efd9402cd213b8c34ee
font_01_sfnt_off00005e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7D 19012 bytes
SHA-256: afbbc6672e5e67d3d08182cb82f0154e2527ac7a9675429207b3e1307e5db0cb

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