Malicious PDF — malware analysis report

Static analysis result for SHA-256 4402139b2e9c398e…

MALICIOUS

PDF

41.9 KB Created: 2021-05-15 01:00:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cc9d9afb089ce94bb34234c79fffb623 SHA-1: 6c1b49f1725f1dc46f146fa46546a739477561ef SHA-256: 4402139b2e9c398e14c651d5549199016221fbae77317c2d191a15e723fa9775
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, masquerading as a 'free Robux generator'. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malicious content or downloads. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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-generator-no-human-verification-game-hack In PDF document text
    • https://www.hbproducts.dk/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/free-pe_GM479516143.pdfIn PDF document text
    • https://www.hbproducts.dk/images/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • https://www.hbproducts.dk/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.hbproducts.dk/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.hbproducts.dk/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46D1 24828 bytes
SHA-256: ac28250946e0b8228abf96aa5611a9b5d8f913a790c7dc0ffdb3bd5804ab07f6
font_01_sfnt_off00007faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAA 18860 bytes
SHA-256: f1337887e63f46ec65b145f76804780e669468724c6330ac6fa0452b843b30d3

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