Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2961e288ae7a0c…

MALICIOUS

PDF

47.9 KB Created: 2021-06-09 04:12:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 855fc5039f23bdeb21f09194e7f64328 SHA-1: 7aecd36c78f4b71210a4bd4c9b8c85abefa678d3 SHA-256: 4f2961e288ae7a0cc8497f8c0696f2c409a42f79daa90e78bd43fc7e4d2a2561
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically promoting 'free Robux' and game hacks, which is a common lure for phishing or malware distribution. The heuristic firings confirm the presence of malicious redirector links and a game hack lure. Although no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that lead to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/can-i-earn-free-robux-game-hack In PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/pubg-uc-at-cheap-price_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/tiktok-unlimited-free-trials_GM835599320.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-roblox-money_GM431946152.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_off0000506d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x506D 25840 bytes
SHA-256: f28af3b68be7971a824e9f1ccd9e2939ca8a264b63c5bbffa8b435e6e8a22501
font_01_sfnt_off00008b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000989c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x989C 18244 bytes
SHA-256: 9f993ce47e543a2789d175c79611ce9039a41f28dde87ea466e61304741eacf6

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