Malicious PDF — malware analysis report

Static analysis result for SHA-256 38673031d2ccb1a3…

MALICIOUS

PDF

32.6 KB Created: 2021-07-05 14:10:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dfb9bdc1946a9a67c6e6375df595c309 SHA-1: 4cc56ff10abdb1469963db2f364b6c11c684c6c0 SHA-256: 38673031d2ccb1a322a0a2a895256dd003718a7c4a279b5a5f117decb23dda66
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be free game hacks and generators. The primary link directs to a known malicious redirector, and the document also hosts a large number of SEO-optimized PDF links, likely to distribute further malicious content or engage in link farming. No scripts were extracted, but the document's structure and embedded URLs strongly indicate 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/479516143/minecraft-skins-free-girl-game-hack In PDF document text
    • http://smpn1sda.sch.id/slims/repository/template-roblox-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-gift-card-numbers-roblox_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hacks-para-roblox-arsenal_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/wearedevs-roblox-hack_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/i-just-got-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-cheat-engine-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-hack-999999-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-and-tix-place_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-buy-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/does-roblox-give-obc-for-free_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-hack-peoples-from-roblox_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_off00002e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E78 21600 bytes
SHA-256: b2bc6a3503e743e8bc24b66fc67af770f2a9f2c8ceacfc7a58615c978f8bca1f
font_01_sfnt_off00005d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1E 18100 bytes
SHA-256: 70cc60e58827411371e7f97bcef6641e7ee3ce3b80f3f16580f1bbb3bdc32b02

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