Malicious PDF — malware analysis report

Static analysis result for SHA-256 821d7faf3c8b2e1b…

MALICIOUS

PDF

47.4 KB Created: 2021-05-12 14:40:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 598aabcff7592297bdea87b223fc872c SHA-1: 9b8128b153ae5033e3b66fb63b7493e42717004e SHA-256: 821d7faf3c8b2e1ba8242089d42ae8adc2675b2810caa5d1efb6ea5bfa09bc84
240 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body and heuristics suggest a lure for game-related cheats or hacks, likely to trick users into visiting malicious sites or downloading further malware. The presence of a fake CAPTCHA heuristic indicates an attempt to deceive the user into performing an action that could lead to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.xyz/app/431946152/robux-codes-game-hack In PDF document text
    • http://library.umuslim.ac.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-robux-easy-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_003_off00004be8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE8 26624 bytes
SHA-256: c421218fe48f646dbd7e3a8e1d150b1b87d87f6dfa05c8b2c68f56b6f5de1cd9
font_01_sfnt_off00008a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A54 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9766 18024 bytes
SHA-256: efd3d7019031a842dae2276fdcf19d9726d4034b37c2d895580446cf97336b03

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