Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c6ba8f76759fbb…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 06:49:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 30c5feff0158d9bbb449f4e9290ad1ae SHA-1: 35d12a2e3c0abb55df86a1e3d9c25f0f18e66e17 SHA-256: 71c6ba8f76759fbb68daff71a5251ab8214ae8b57b52c900a06632d3c71f4fd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically targeting users with lures related to game hacks and generators. The ML classifier also strongly indicated maliciousness. The embedded links likely lead to a second-stage payload or phishing page, attempting to exploit user interest in obtaining in-game advantages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/com-roblox-game-hack In PDF document text
    • https://learnwmf.org/image/data/files/coin-master-bonus_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-people-girl_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/tiktok-free-beer-for-a-year_GM835599320.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-com_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/se-puede-hackear-coin-master_GM406889139.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_004_off000050b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B4 25384 bytes
SHA-256: ff9b63da3c82fa4057f45eb2d8c9800fb2a5cebbac5f2b9875a208df158fec5d
font_01_sfnt_off000089ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CE 18044 bytes
SHA-256: eff775d92ef8bd491319eac85ef909b2198b057cd93ad57b214b1357dcb648b5

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