Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c465a19bfb09ac…

MALICIOUS

PDF

46.4 KB Created: 2021-05-19 06:03:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d3826659a958fc45cc36b40573b7af0a SHA-1: 07f70037bc248c4dcfefe69f795a86985f2803be SHA-256: 39c465a19bfb09ac0a4f05a92d1b1a36d6f78d3b504779c285992d3271990add
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and SEO-optimized PDF files, masquerading as game hacks and generators. The primary lure URL is https://netcdn.xyz/app/431946152/hey-google-how-do-you-get-free-robux-game-hack, which is associated with a known malicious redirector. The document body, though partially obfuscated, contains similar URLs and text related to free Robux and game hacks, reinforcing the lure. The presence of numerous links and the ML classifier's high confidence score indicate a deliberate attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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.
  • 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/431946152/hey-google-how-do-you-get-free-robux-game-hack In PDF document text
    • http://baah.ca/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://baah.ca/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://baah.ca/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://baah.ca/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/minecraft-free-exe_GM479516143.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_off000048fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FE 31504 bytes
SHA-256: a7d1e6a8599f9450bac46da547a21dc66cb5322f66f1a517ac88d17447206b6b
font_01_sfnt_off000090a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A8 19156 bytes
SHA-256: 2eaf05fb5b81c851c34d40d7c07e26ddd9b324a9c4f95fd917841cb6815dc612

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