Malicious PDF — malware analysis report

Static analysis result for SHA-256 44427618265d5994…

MALICIOUS

PDF

48.2 KB Created: 2021-05-13 22:34:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c1ce522eaa9367c390ed9cb8b12cbf9 SHA-1: bbfffe47d36eea9e427c30700d21a92963a8bc2b SHA-256: 44427618265d59940d1ca62175a906447c01519693b411845a396327c1adb225
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The document body and heuristics confirm the intent is to trick users into visiting these sites, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/431946152/free-robux-no-survey-game-hack In PDF document text
    • https://www.ausecus.com/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.ausecus.com/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ausecus.com/images/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • https://www.ausecus.com/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://www.ausecus.com/images/robux-codes_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • https://www.ausecus.com/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.ausecus.com/images/roblox-free-printables_GM431946152.pdfIn PDF document text
    • https://www.ausecus.com/images/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://www.ausecus.com/images/free-flip-master-coins_GM406889139.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_off0000546d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x546D 24952 bytes
SHA-256: 58f3394f255b349642a66b7a73a8e80a0acb063e717348eb75dd38f402acb4d2
font_01_sfnt_off00008dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD7 3464 bytes
SHA-256: 8e24205afdd13dcdea98f8150ef77dee4030e0e50a7c748783d1b4598e034a20
font_02_sfnt_off00009a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0C 18308 bytes
SHA-256: d3a10f634c5ecc3d7353c949fdf4d39280fe41fff4e373acd575ae0d5bea3c9d

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