Malicious PDF — malware analysis report

Static analysis result for SHA-256 132c9ba96a06d9fe…

MALICIOUS

PDF

56.2 KB Created: 2021-06-11 01:54:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1092f34615f29d679eb91bb1dec08595 SHA-1: 3628dd90a55d9b53e097b0688eac93fddf8f0228 SHA-256: 132c9ba96a06d9fe7d49538ccfcdbb653d3bb9c0719b7ab6b428cf49503f8798
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to a known malicious domain, disguised as game hacks. The document body, though heavily obfuscated, contains references to the same URL. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be luring the user to click a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

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/jump-higher-hack-roblox-game-hack In PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/como-ser-hacker-en-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/dev-console-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/pokemon-go-free-2021-tier-list_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/bloxburg-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/pubg-uc-500_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/roblox-hacks-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_off000053ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53CA 29832 bytes
SHA-256: 0913561ccb7e78b2a7871826089b72fc923957a73dce4ac431b08a75ce1fd1d1
font_01_sfnt_off000099c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C4 8772 bytes
SHA-256: b2558abb3910ad21f6ec2b2071232353dfdc9d66fdcf35e066b0c6a4c84dcc36
font_02_sfnt_off0000b665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB665 19496 bytes
SHA-256: e9cebca0e83d5175f58c473cc73e09b09c2718d8cefa8366c8cc5c29e936e9d8

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