Malicious PDF — malware analysis report

Static analysis result for SHA-256 158b9738bdebeac8…

MALICIOUS

PDF

36.9 KB Created: 2021-06-26 15:46:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 97609ec2988dedd733aedc0b8ad48b57 SHA-1: 160cca8d5fb7460e00cffe5f8e33c78f21920ad4 SHA-256: 158b9738bdebeac82453111c85fbf997b7fb8717f6d7276719a0646514474c64
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as 'game hacks' and 'free currency' generators. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further stages of the attack, potentially downloading additional payloads or redirecting to phishing sites.

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.co/app/431946152/hack-robux-2021-do-inspect-element-game-hack In PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-after-the-flash-hack-item-unlocker_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/code-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3667 22432 bytes
SHA-256: df7e86049970d33af0089ef04d1ac0dc2928642e7efc5500976544e531edcf0a
font_01_sfnt_off0000688e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x688E 19908 bytes
SHA-256: 3ce4f9e67c88e221e03dec3d3a5f3a2074e9722b317e6dde7d605b4d00a453c3

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