Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5505b919b2ef865…

MALICIOUS

PDF

35.9 KB Created: 2021-07-03 12:11:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 744bb999688fd156a80608c4ce229c71 SHA-1: d383d52a20ec229e968b6be8c6a8f247c29764d2 SHA-256: a5505b919b2ef86573d969647883bdb4a9ce7c0309307b7918bcef79b2522ea5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising game hacks and free currency generators. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms these links point to known malicious infrastructure. The document body and embedded links suggest a lure for users interested in game cheats, likely leading to further malicious content or malware downloads.

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/406889139/coin-master-unlimited-free-spins-link-2021-game-hack In PDF document text
    • http://razredna-nastava.net/files/roblox-lifting-simulator-free-vip-server_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-stranger-things-promo-codes-cheat_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-run-fast-roblox-the-strets-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/what-items-are-free-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-lvl-7-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-cheat-money-in-jailbreak_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-weird_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-gear_GM431946152.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_002_off00003140.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3140 23444 bytes
SHA-256: ca4d11a49becbb145b803f30f7b4004ed7a38513701086e41363df04b3e4acac
font_01_sfnt_off00006660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6660 19440 bytes
SHA-256: b2b3789fe11c4db7e066a8eb5d686554983605e7bfb32815db272dec4a6beb84

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