Malicious PDF — malware analysis report

Static analysis result for SHA-256 130899406c61375d…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 18:35:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3ded0a8d2e06570530717c3e284e6faf SHA-1: a26419414b6a03ac4acecaa393727d188912341c SHA-256: 130899406c61375d0be22dcc1716ba702baa400340251585bbfa8a85b4cb1904
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a social engineering attempt to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/minecraft-name-tag-hacks-game-hack In PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/robux-for-surveys_GM431946152.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://e-learning.man1wonosobo.online/__statics/gudangsoal/files/how-to-get-unlimited-robux-2021_GM431946152.pdfIn 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
stream_003_off00004c9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C9E 24044 bytes
SHA-256: 16c34dee0f1f0492a6fe9d263411425575ff23eac951c92fc0e0e39be937f191
font_01_sfnt_off00008242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8242 18288 bytes
SHA-256: eb7ed4260d6d64c3cd9f3242d6af3157cea31df7eff6e4be90ec8e6c005c47d1