Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5db9a86881489d5…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 03:46:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 940c71d61c14570d1ba5a4f1af7c8a61 SHA-1: e06602bd5f3fc41d2ddfa60d58ac28c3274a537b SHA-256: c5db9a86881489d5237dd79594d1e38787ffb9e2a906b6a5ed3b8ef1fc35e9da
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be free game currency generators or hacks. These links redirect to malicious infrastructure, such as 'netcdn.online', and also point to a large number of other PDF files hosted on 'lib.unitri.ac.id', suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/roblox-website-robux-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/is-pubg-uc-hack-possible_GM1330123889.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_off000051a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A5 26524 bytes
SHA-256: 3b4b6687398adebb73f15314d085272ac72038b2c918d6b9d21744ad74d6b456
font_01_sfnt_off00008dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAC 18348 bytes
SHA-256: cc91b2fc9b75ec06329357e94e6432728e351a563ac2c83234cad17065899ff2

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