Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed524c4cb5179a4f…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 20:32:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b6188ad7d0d3fcf116f9efe52498fc89 SHA-1: d905ab727a0670ea59a9c31aa04dd34922c8391d SHA-256: ed524c4cb5179a4fd9749f4d3c8b9154e871e58fcc6082caac95b51cc9c75bbb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external URLs, including one identified as a malicious redirector. The document body and heuristics indicate a lure for 'game hacks' or 'free generators', suggesting the intent is to trick users into downloading or visiting malicious sites. No scripts were extracted, but the embedded URLs and redirector findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-spins-coin-master-hack-2021-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/make-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-items_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/gamesofficenet-hack-coin-master_GM406889139.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_003_off000049d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D4 25060 bytes
SHA-256: 15c3cd3f4dc1c33500f02655bbe5009bf01b16bc1f32b83de1c765408c77eefb
font_01_sfnt_off000082ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CE 18456 bytes
SHA-256: 8f74d6ddd2abce9f563610cbfcc253ce51c057807514da134dc64dcb58b7111e

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