Malicious PDF — malware analysis report

Static analysis result for SHA-256 efea9aca75c1a65f…

MALICIOUS

PDF

41.2 KB Created: 2021-05-16 09:40:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e31e7aa325ffacf60b541e6df28be8de SHA-1: b7ef3b53a37e1bc5083c75e264937ee0ccad99ff SHA-256: efea9aca75c1a65f33c50bdf0b45468fdddc6da51d3179c73c988ef8e7e83eea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free spins'. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs and the document body's content suggest a lure to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

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/406889139/free-spins-coin-master-links-game-hack In PDF document text
    • http://www.hlad.hr/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/oprewards-login_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/wurst_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-attack-block-hack_GM406889139.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_off000047de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DE 25064 bytes
SHA-256: 545180f2df7eb4ef977b26a7390bf37cc421a422ae6dc1aeee118acef886f86c
font_01_sfnt_off00007f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5A 18056 bytes
SHA-256: 07f1a9832fff0ce02b8ea8bcbd6448fb7022c7ac6c85a00fb5b887865844234a

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