Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cec60843e8efc0a…

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 18:16:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4c340d31ec1d67f7e2f95500c8e98569 SHA-1: dc8e448d95cd0b8d19d1258104bd314e695b5f96 SHA-256: 1cec60843e8efc0a814613d7c94c35094391c125fcf7027c51af6d44e35503e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them, ultimately redirecting to a malicious URL. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and employs a game hack lure. While no scripts were extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to drive users to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/robux-free-promo-codes-game-hack In PDF document text
    • http://www.hlad.hr/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C44 25724 bytes
SHA-256: ee6bf4041f308ccbc530a40ed273a5cd2d48e95bb630f99f6fe691faa48c7899
font_01_sfnt_off000086c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C0 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off0000907c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907C 18604 bytes
SHA-256: 72370e69d4b3437de95b76ada03da26e1fdb3d0ee534a059885e6f785b63064d

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