Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfe355bb255903c…

MALICIOUS

PDF

47.8 KB Created: 2021-06-08 14:53:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 44be7ff402fa98387558e7eab03d3995 SHA-1: 11f7d6c5d19116d0ed5d3cd1377838b9df18cb09 SHA-256: 7cfe355bb255903c9e0f8856952d43d86dc1dec042dfb516418ca61ff5266cce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators. The document body and extracted URLs strongly suggest a phishing or scam attempt to lure users to malicious websites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/ccv3-roblox-hack-how-to-through-walls-new-2021-game-hack In PDF document text
    • http://librarysenior.com//repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/pokemon-go-free-coins-2021_GM1094591345.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-generator-no-human-verification-2021_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_off0000529f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529F 24036 bytes
SHA-256: b572efb31c5dbc2b3fb397cb81ea85a89016c9c25644dd87a8b9518d152d4761
font_01_sfnt_off00008977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8977 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00009312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9312 19828 bytes
SHA-256: 50b7e5f3d2058cd19700d29c2f78e3ad7e25225ce7b42f774d09e4adbe643e6a

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