Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd079f82a976bf…

MALICIOUS

PDF

41.6 KB Created: 2021-05-13 04:44:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8f256164b37e98f628a34db05cc55534 SHA-1: 32386ee813ca6a7bb95330c5eeef51eb75fc148e SHA-256: 19cd079f82a976bfd7266fd2f47491622d52c62a7d029d7f1384a1828b25b209
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary redirect URL is https://netcdn.xyz/app/431946152/free-robux-for-free-game-hack, which is flagged as a malicious redirector. The document body, though partially corrupted, contains similar lure text and URLs, reinforcing the phishing attempt. No scripts were extracted, but the embedded links are sufficient to indicate a malicious intent to redirect users to potentially harmful sites.

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/431946152/free-robux-for-free-game-hack In PDF document text
    • http://empresa-venta.hr/files/_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-group_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/hack-robux_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-spins-coin-master-android_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_off000048ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AC 24620 bytes
SHA-256: 09b52b890f092f708eea29bbe1ac3fa62a9ba8996f9e1019515af2a6f43e0625
font_01_sfnt_off00008119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8119 18012 bytes
SHA-256: 3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360

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