Malicious PDF — malware analysis report

Static analysis result for SHA-256 b703f2375ca77177…

MALICIOUS

PDF

36.1 KB Created: 2021-06-17 21:22:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ac90f302e7e7c36775cd122f71301601 SHA-1: 4de69fb5bac4181970027e154c68ebf1f0e852ea SHA-256: b703f2375ca7717727d4ca34c101468543743d3a801cc9ac4ea144a0cd07d834
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors, disguised as game-related content such as 'Roblox hacks'. The primary malicious URL identified is http://netcdn.co/app/431946152/roblox-i-dont-feel-so-good-hacks-game-hack. The presence of these links and the ML classifier's high confidence score indicate a strong likelihood of this document being used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/roblox-i-dont-feel-so-good-hacks-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-charcters-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-do-you-get-robux-unlimited-free_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/do-things-from-hack-week-ever-make-it-into-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-obby-with-out-liking-it_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/pastebin-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/gamekit-roblox-800-robux-free_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-spin-hack_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_off00003408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3408 23140 bytes
SHA-256: 64715bd57e9127c736c5386585f941db6ba595b95f5838ce69a70c374e9b3b7d
font_01_sfnt_off000067f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F7 19080 bytes
SHA-256: 43b12eaedc6b02f6b1958a123105e8ebf540fae95e8e1a516b0af78996982769

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