Malicious PDF — malware analysis report

Static analysis result for SHA-256 1981606790c6684f…

MALICIOUS

PDF

45.5 KB Created: 2021-05-15 00:39:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fbc64cb8a567d5e6ad7c6d1986aa06b4 SHA-1: 50eedfec828da816f2a99014daddc0783f8a03ea SHA-256: 1981606790c6684fa1e9021a1427b269cfa6d9158b2b791023920756edf7bba3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including a critical redirector link to 'netcdn.xyz', disguised as game hacks and free currency generators. The document body and heuristics indicate a lure for potentially malicious content, likely leading to further exploitation or malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • 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/coinmasterfreespins-game-hack In PDF document text
    • https://imagineclimb.com/images/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://imagineclimb.com/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://imagineclimb.com/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/fbchampion_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://imagineclimb.com/images/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://imagineclimb.com/images/roblox-free-hair-boy_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a53.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A53 25396 bytes
SHA-256: e9e8c423d3156fb6037baf2f01238746daf61415bbd9658fc2f4b278dad5d9e0
font_01_sfnt_off00008520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8520 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off0000904a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x904A 17980 bytes
SHA-256: 48872130680f0d6309128a4b322cbb0730700ec4544966fd5aa3d357de7636d5

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