Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf9bb1fe46b3393…

MALICIOUS

PDF

35.1 KB Created: 2021-05-21 03:10:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 571e5e8bb7521085a2fefce9f8906103 SHA-1: 121ec8e31df5a9cec11d839c0db867b10bdcd300 SHA-256: 4cf9bb1fe46b3393467b1a4b89180f7cf4e19dde3527a4c4238218e53b8259f8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as game hacks and generators. The document body and heuristics indicate a lure to click these links, which likely leads to the download of further malicious content or exploits. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/406889139/coin-master-free-stuff-game-hack In PDF document text
    • http://skwolcott.com/images/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/free-minecraft-account-and-password-generator_GM479516143.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_002_off0000310a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x310A 24388 bytes
SHA-256: 925dd067bdb33ac0b6e903740206b18f394737a54105369701ed1ed2e0beea90
font_01_sfnt_off000068fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FC 17848 bytes
SHA-256: 49970788d519349fbd5ba6badf06c324563f4794a9a5c1e41d0627a31815ac32

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