Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac189753a420b97…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 15:49:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: db09e62cd0e24446547e70a1e8d93348 SHA-1: 05eecd814bf76e8235dfa103163de466056560f3 SHA-256: 1ac189753a420b97fa06d4da19d91933650c27756e2174f5028cebc25ec519de
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, including a known malicious redirector. The document body and heuristics indicate a lure for 'game hacks' or similar content, designed to entice users to click through to potentially malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an intent to redirect users to further stages of a malicious campaign, likely involving phishing or malware delivery.

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/camping-hacks-roblox-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-card-pins-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/pokemon-go-free-account-generator_GM1094591345.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/i-need-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/website-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-computers-in-flee-the-facility-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/get-free-robux-by-downloading-apps_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-generator-no-human-verification-2021_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_off000055ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55EF 24176 bytes
SHA-256: e1b9818b0108293d5aedd51cad2696fdde857522bb68ca2bbaa863e455d25714
font_01_sfnt_off00008cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD3 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB6 19028 bytes
SHA-256: 26939c3f7de1f57a04ef67c73dbe773fb552b9143f98535e5f9f15a38b603310

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