Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b08b56601f6fba8…

MALICIOUS

PDF

50.5 KB Created: 2021-06-07 08:57:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 52831725a4ae1e581da0bf2190e43259 SHA-1: b0d54f8e284e900a99bb57afb57d8735104ac3e4 SHA-256: 2b08b56601f6fba85d85c322e1942d88e988ab7c73c5a7be0332a2ecea5c268d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a malicious redirector, specifically luring users with promises of game hacks. The primary URL identified, https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-2021-march-game-hack, is flagged as malicious infrastructure. The document body, though partially corrupted, contains similar lure text and the same URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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.tw/app/431946152/how-to-hack-roblox-accounts-2021-march-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/cm-spins_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/pubg-uc-18_GM1330123889.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/mcpe-116_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/mcpe-master-hack-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
font_00_sfnt_off00005626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5626 26864 bytes
SHA-256: 19a7f83c175f2e6c4ccbcfa072f6988e52058d3750fd2d47f080232e8ce73dec
font_01_sfnt_off000094d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D1 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00009f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F77 19356 bytes
SHA-256: b9c62492d1a5ae97a7ae0817d2a1e6a22372b4464ac01f82f81b304d22888f39

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