Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9490c936787870e…

MALICIOUS

PDF

37.1 KB Created: 2021-05-23 00:49:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e2fd959382fce9a502732f2c8b0ebf6d SHA-1: 9aa083e4cb4fd3ebeaddfa2c469e11f3cce37d2f SHA-256: b9490c936787870e268202177d1d3d001adf328340ae07eb8075c8dfd97658c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free coins' and 'game hacks' for popular games. The document body and heuristics indicate a lure designed to entice users to click these links, which likely lead to further malicious content or malware downloads. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9444

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/free-coins-coin-master-game-hack In PDF document text
    • http://lamascheradiferro.dk/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://lamascheradiferro.dk/images/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://lamascheradiferro.dk/images/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lamascheradiferro.dk/images/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lamascheradiferro.dk/images/roblox-apocalypse-rising-hack_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_off0000386c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x386C 25108 bytes
SHA-256: b49c72601734a23251dba582da201efeb1b6d6c65312c3f869238b13cfb9ea97
font_01_sfnt_off0000711a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711A 17712 bytes
SHA-256: fd51fa1b849cf95139b510f282bcd47e41e352499df1938c7ca947a320e7b070

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