Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de7af11593c82e9…

MALICIOUS

PDF

35.9 KB Created: 2021-07-07 10:48:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1bf008558c4fe2c9613a8eac1890c540 SHA-1: 4ba3604aee0859a73d14bb6fb20357d1036586e5 SHA-256: 5de7af11593c82e99798c5872a89271abb72c58a6b6278bc964a35fa7c17dc02
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically promoting 'free generator / game hack' lures. The document body and extracted URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted from this sample, but the PDF structure itself facilitates the redirection.

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.tw/app/431946152/how-do-you-get-free-robux-without-paying-game-hack In PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-bc-roblox-android_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-roblox-women-hair_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/get-free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-labeled-cheater-in-roblox-parkour_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/hacked-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-fast-ponits_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-bloxburg-free-house_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-hack-android_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-do-you-earn-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-online-minecraft-server_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
font_00_sfnt_off0000312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312E 22952 bytes
SHA-256: 780bebe898d9f27227d818ae5a65d51ec7453ac2d866fd698fb7ef05b112058b
font_01_sfnt_off00006442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 20132 bytes
SHA-256: a9ef46bf9427767a57211f84010808dc7dc7e4c48ad05ca9a6e16d4f2e8bde0e

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