Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5641244e46de7e9…

MALICIOUS

PDF

47.9 KB Created: 2021-06-11 07:01:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ab70384c52059a990821732bb6959280 SHA-1: 08170e76538412ca39e6d7ca1995dc4c3c0d7ea3 SHA-256: c5641244e46de7e933ddb70ac105f480bdf21dfa939fcadb07cf175cd33f430f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users with promises of free in-game currency, such as Robux. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'free Robux' and 'game hack', reinforcing the lure. The presence of numerous PDF links suggests a link farm intended to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-2021-easy-game-hack In PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/free-robux-hack-2021-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/how-to-hack-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/hacks-for-roblox-phantom-forces-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/free-hiring-scripters-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikeshamzar.ac.id/repository/free4mobile24-free-robux_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_004_off000052d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D9 30236 bytes
SHA-256: 19468760ce870e04f66ffde8b427519e37bde6b531c95467d30a33fb12754572
font_01_sfnt_off000095d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D9 19164 bytes
SHA-256: f2997472ea942b0edce641d6a41454e27ebc1d02351322f968d4f5d62f55d9a8

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