Malicious PDF — malware analysis report

Static analysis result for SHA-256 554359751310b751…

MALICIOUS

PDF

51.4 KB Created: 2021-06-09 07:01:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d9d5ab50ce84cd237b294dbe0fd53da5 SHA-1: 7a3ef669e1fa9f6490684ddf274c67eecfef5710 SHA-256: 554359751310b7510d51594616364d380a4659f115e268ad30fc29d617c2a97f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that promise free game hacks and currency, a common lure for phishing or malware. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links points to known malicious infrastructure. While no scripts were directly extracted, the document's structure and embedded links strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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-no-human-verification-on-laptop-game-hack In PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/tiktok-free-app-download_GM835599320.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A4 26032 bytes
SHA-256: 7020b9a80cb6765c1a1a21cce73c0dd2bb666047baa123f9ad7afac2be5e1266
font_01_sfnt_off00008ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE5 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9691 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000a338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA338 19200 bytes
SHA-256: 69dfd08f4ce6287124c0021273ebd36268a20ac71033f544165e4d7db31b3e22

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