Malicious PDF — malware analysis report

Static analysis result for SHA-256 705fcf924e28213d…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 22:48:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e1c54d65d08ef0554723d4862e3d7c1e SHA-1: a5ebc38832a910f3eba45a0911ae484a458dbc4f SHA-256: 705fcf924e28213d81a1ec098c9939010f25cd46a1270b21be1f9fac45523c75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/get-robux-now-game-hack. The document body and heuristics indicate a lure for free game currency or hacks, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of malicious links points to a likely attempt to download further malicious content or redirect users to a compromised site.

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.tw/app/431946152/get-robux-now-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-meep-city-free-plus-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/tiktok-free-2021-followers_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-browser-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-apk-hack-mod_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-codes-for-robux-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-codes-september-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-gae-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/what-games-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-bedrock-edition-pc-free_GM479516143.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_off000033c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C1 22896 bytes
SHA-256: 0f6e8c67b1d3e2bf3ddc647add43a47ea30b33270cfd415dc18844c657cf9d0f
font_01_sfnt_off00006700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6700 18820 bytes
SHA-256: 4970f7dcbd1b5258a024dd8dd3f3b392a6d16d1df167f7e06bb60c0b0dc666b1

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