Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b35ef87fb69764…

MALICIOUS

PDF

43.7 KB Created: 2021-05-14 03:11:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2648eb698e837904b756de7b20e514f9 SHA-1: 56569a211a7026dd172bc7b333b3df26c748f3af SHA-256: c1b35ef87fb6976406948c68a8ec233a09cba28ae88f548451958f05c901e4c9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links designed to lure users into clicking on what appear to be game hacks or generators. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The presence of a download button lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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/431946152/free-robux-stream-game-hack In PDF document text
    • https://meltonschool.org/images/robuxmatchcon_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/rbxdemon_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-spin-link-for-coin-master-game_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_off00004afa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFA 25992 bytes
SHA-256: e0c61304ffd39da219cc29a1641a406c0d1d6936973e88c681ba45c4967917e8
font_01_sfnt_off00008774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8774 18608 bytes
SHA-256: d58c1050c241e8596ad00b07d95ef71c6ad75f8aac12cbee34afc6366c1e008e

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