Malicious PDF — malware analysis report

Static analysis result for SHA-256 116816746999f55f…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 04:13:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6e65944959f7c296c16d097da68288bb SHA-1: 921a4f9e9373f85978d64b89182847ca84e94016 SHA-256: 116816746999f55f647625a68516976fd4783bb389728a2c9113f5deaa1cec56
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that are either known malicious redirectors or part of a link farm designed to attract users with lures related to free game hacks and accounts. The primary link directs to a site offering 'free accounts roblox passbin game hack'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/free-accounts-roblox-passbin-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/best-free-roblox-explits_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-games-free-robux-bye-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5093 25136 bytes
SHA-256: c79cdaa57161e98f7f3330e1a2dcb8d0cf660ec3fdb2b7dbb4d8bb8f93c353b3
font_01_sfnt_off00008afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFB 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000097a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A2 18696 bytes
SHA-256: 07a5f4ca1ec41cea9c8671a2d6e188b4928136db1944ffd29e25e7d1a3228f5a

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