Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef3abe2fca78134…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 11:04:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 31c14c87d7e888924215056fa58de7bf SHA-1: c8e1c8b69eff35981a1fd6dd9756d6ee21c5a150 SHA-256: 6ef3abe2fca781349dcbbf022234135edba649958f5c1d30361d6bca264f17fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious domain, likely to lure users into downloading further malware or engaging in scams. The document body and heuristics indicate a focus on 'free Robux' or game hacks, a common lure for phishing and scamming operations. No scripts were extracted, but the presence of malicious redirector links and the ML classifier's high confidence score strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/robux-free-online-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-clothes-on-roblox-inspect_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-coins_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-claims_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/is-it-hacking-if-i-use-autoclicker-in-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/aimbow-hack-fr-roblox-strucid_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-hack-999999-robux-android_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/como-tener-hacks-de-armas-en-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/play-roblox-free-online-login_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/teleport-roblox-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-on-roblox-btools_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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_off000032e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E6 22884 bytes
SHA-256: 5824dec4149b7a937d7cf46135cbb62b45c551ad118947b78befd6554f3ee6d3
font_01_sfnt_off00006625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 18912 bytes
SHA-256: ff36d619ce8e62cd296b26c96b34fbe88819c62effb096e20d6751b4628d3f13

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