Malicious PDF — malware analysis report

Static analysis result for SHA-256 505fc59e6cadf7cb…

MALICIOUS

PDF

34.3 KB Created: 2021-06-20 02:43:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d29babc2ced911ae673c6da52c0a1838 SHA-1: 6b5ba8b534f8ddf570c4b02d52f6f73db1317307 SHA-256: 505fc59e6cadf7cba07147d3bed7b0b745c214005d3b21c14a08cb037cfad17a
180 Risk Score

Malware Insights

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

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-candy-van-mesh-roblox-game-hack. This infrastructure is used to lure users with game-related content, likely to download further malware or engage in phishing. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://netcdn.co/app/431946152/free-candy-van-mesh-roblox-game-hack In PDF document text
    • https://alimi.com.tw/upload/files/free-songs-for-roblox_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/pubg-uc-carding-quora_GM1330123889.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-weird_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/demon-roblox_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/contact-roblox-about-being-hacked_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C86 22700 bytes
SHA-256: 3df45585de4b087b3962e9f9839e36693124c664b98586617ea97fdee13094e8
font_01_sfnt_off00005f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 19500 bytes
SHA-256: 0afc60ec730684eedd7a5824ce3413e1e5f69987cfb4b166cf7f984391e1888a

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