Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9c1ceef64d9051…

MALICIOUS

PDF

49.5 KB Created: 2021-06-08 22:51:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f513da32a438fcb9dfdc8bd9daea3fd SHA-1: 772832e49dc5dc9b55f14384960194fc924c9c36 SHA-256: dc9c1ceef64d9051ad896ebb0887d9f0d1ee168acfb25511137b2931412d2f81
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, masquerading as game hacks or generators. The document body, though heavily obfuscated, contains URLs that are consistent with this lure. The primary attack pattern involves tricking the user into visiting a malicious site via a deceptive link, likely leading to further malware download or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/mad-city-hacks-roblox-windows-7-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/pokemon-go-free-walk_GM1094591345.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-but_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-someone-on-roblox_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
stream_004_off00005225.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5225 26268 bytes
SHA-256: 071a77a65293ab7a946f7261283a93e65966541108b8a9b79b444ebe1c8dd047
font_01_sfnt_off00008e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E91 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B39 19376 bytes
SHA-256: dbefc98237f38be0306a8f16a7ee92883d7ad98eae093404865057af514a095b

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