Malicious PDF — malware analysis report

Static analysis result for SHA-256 159311e34b1d1927…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 04:59:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70b1bcf68c18b81f3dd579e6c1aa8091 SHA-1: 431c0fbf1b0ec3c21901a732ca9f039f790401c7 SHA-256: 159311e34b1d1927e10523c1655b43931ca2442b95130d9860cadbf8e0a612a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, with one specifically identified as a malicious redirector leading to a 'free generator / game hack' lure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the lure suggest an attempt to direct the user to a malicious website, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spin-coin-master-hack-2021-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-free-clothes-maker_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-book-wings-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/fake-gps-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/flame-gg-earn-robux-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/royalty-free-roblox-music_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-hack-that-saves_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/moon-active_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-get-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-bc-accounts-roblox_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_002_off0000336e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336E 23208 bytes
SHA-256: 3afbfcb4f6a93f60bf9d61de586eed5082685c3fc3f2099423336e03aeb1299d
font_01_sfnt_off000067fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FD 18748 bytes
SHA-256: 09e9522e43d1493e395b46c6e396a2d39f5a619d28468af8eceb278664062f1f

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