Malicious PDF — malware analysis report

Static analysis result for SHA-256 c649a513386433a6…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 04:16:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dd3e1338c3768538a33ebe7577b41d7f SHA-1: 0cf681de5dfd2aaefdc79fbd83f534b8a8ce41bf SHA-256: c649a513386433a651e8079c0d6a869dd5458569017a44444ce5be57d8b91d14
260 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, such as the one pointing to 'coin-master-hack-mod-game-hack'. The document also contains a large number of SEO-optimized PDF links, likely part of a link farm designed to drive traffic to potentially malicious sites. No scripts were extracted, but the presence of embedded URLs and the fake CAPTCHA lure strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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/406889139/coin-master-hack-mod-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/instant-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/get-roebucks-com_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_003_off00004adf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADF 24076 bytes
SHA-256: e29cfff5af5385c37c7009fd4bffe89a1eb574d7dff65862dd74094361d0a1a0
font_01_sfnt_off0000812e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812E 17888 bytes
SHA-256: e62afa66f607182040d09b880d4636e767d1d74cbf365a0d0e0f611dcf9512c5

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