Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bc74fbf3e215be…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 00:42:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 38749f76114adbc79e3dbffc5e25c40a SHA-1: fa7ca7d6400f49a8c77eaf9db624f2fc62713f15 SHA-256: a1bc74fbf3e215be06d651bd0beef0723bb37cbaa2d6958320792fbcdcc03f38
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF contains a malformed exploit stream and links to known malicious redirectors, including one for a 'free generator / game hack'. The document body and numerous embedded URLs promote game hacks and free in-game currency, indicating a social engineering lure to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/406889139/free-coins-coin-master-haktuts-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-apk-mod-hack-robux-infinitos_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-free-hack-pc_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-2021-easy-nov_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-para-tener-750000-de-robux-gratis-5_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-how-to-fly-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-pizza-place-money-cheat_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/ultimate-trolling-gui-roblox-download-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/real-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/retail-tycoon-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/mad-city-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-project-overrising-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-into-your-account-right-now_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off00003350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3350 22612 bytes
SHA-256: 24b6ff47a6363b52a84002cb3d45d65d1912e63f4cac423696f301ed31561b1d
font_01_sfnt_off00006563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6563 18308 bytes
SHA-256: c10b2ce2116ce86515ac537777e6aa729f43e458fc79ee6425be9f5ece8a010a

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