Malicious PDF — malware analysis report

Static analysis result for SHA-256 0004301973df4d51…

MALICIOUS

PDF

47.5 KB Created: 2021-05-14 18:31:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36ee1c822dd3a9a99d56355068d12fc7 SHA-1: a961c31e48dbd91e856c316e0bbcc4866c9429d9 SHA-256: 0004301973df4d513f2949e1a39f71f2a1b5e27a86c2245cf6510c78b8248fd8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external websites, many of which are identified as malicious redirectors or part of an SEO link farm. The primary lure appears to be related to free game items and hacks, such as 'free spins' for Coin Master or 'free Robux'. The document's structure and the presence of multiple links suggest an attempt to drive traffic to potentially malicious or scam-related content, rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/free-spins-coin-master-blogspot-game-hack In PDF document text
    • http://grupodin.com.br/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://grupodin.com.br/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://grupodin.com.br/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://grupodin.com.br/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://grupodin.com.br/images/coin-master-mod-version-free-download_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
stream_003_off00004e0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0E 28400 bytes
SHA-256: 91e131b831a3281881b9b871cf67f6af327bae4ea4b5f7d5b0e7e83068f8621d
font_01_sfnt_off00008d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D25 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off000096c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C5 18464 bytes
SHA-256: 1c6dfc1f98a6641c171a543c2046344b7d819ff3e085ab3ae56c0ac3320f4f50

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