Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f305149f19de62…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 09:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0372e154cc24914cf52fd4c0591a2206 SHA-1: 6aa2b8969504457117f6efc24b1bc2abb51df68f SHA-256: a1f305149f19de629eb698b5f998b08ad37ba536c8e5d22a983455e88d6d80bd
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency and hacks to entice users into clicking malicious links. The document contains numerous links to redirectors and link farms, including a primary malicious redirector at http://netcdn.tw/app/406889139/coin-master-free-spins-without-verification-game-hack. The presence of these links and the overall structure strongly suggest an attempt to lead users to potentially malicious websites or downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-without-verification-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-pants-girl_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-money-codes-for-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-download-roblox-apoc-hacks_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-often-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-into-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-free-tips_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-stage-7_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robloxcom-free-kkk-k-k-k-k-m-k_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-with-no-serveys_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/hack-in-roblox-como-hackear-roblox_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_off00003104.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3104 22512 bytes
SHA-256: df1c3524eef0aaeb5450efe144b77922e8e80dd5003571e04148d7ef972f039b
font_01_sfnt_off00006316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6316 18812 bytes
SHA-256: efebb9ab85318ef2fcc466b1ba77fdbcbd0ba4e561c4fe4ef6f775257a73b700

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