Malicious PDF — malware analysis report

Static analysis result for SHA-256 631474a375c2f215…

MALICIOUS

PDF

57.5 KB Created: 2021-06-04 03:59:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0ca1d5de81f3e2a1c9124aa9302fe52b SHA-1: e950e21145e36f04df59863ffcaaa877f06d4b83 SHA-256: 631474a375c2f2159ac5a2c78cc33a41c09a07b3435153739b56c76b5da1eaf8
200 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a 'free generator / game hack' and presents a fake CAPTCHA to trick users into clicking it. This behavior is indicative of a phishing or scam attempt designed to lead users to potentially malicious websites. No scripts were extracted, and the document body is heavily obfuscated, limiting further analysis of its direct actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/406889139/how-to-hack-coin-master-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A3 27012 bytes
SHA-256: f78873c96c6c86412d796118fc2f078f760a2954ea07877c8286475b2868927d
font_01_sfnt_off0000927e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x927E 3196 bytes
SHA-256: 931ef9c7098e624ddf53d84d5e4bbb137479e1af1ec69aebb433621e1be3068a
font_02_sfnt_off00009db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB3 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000b0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 17880 bytes
SHA-256: 811ddb8557bc0f5be85009fa6d5ae0baa2b7fc09c58d91c5790597872cecd122
font_04_sfnt_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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