Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d18e6c30b2a86b…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 12:26:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4216368d8ce66523c03c7060b6c27f9a SHA-1: b13555c6bcbb2671fb8193ccf085da91c7f83f14 SHA-256: 40d18e6c30b2a86bd37949d88524187d24a8396eef9e2351d825275c4ef5725d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirect URL is http://netcdn.tw/app/431946152/get-free-robux-without-doing-anything-game-hack. This indicates a social engineering tactic to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the embedded links and heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/get-free-robux-without-doing-anything-game-hack In PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-free-codes-on-toys_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/big-brother-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/rbx-earn_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-and-tix-on-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/pubg-uc-shop-myanmar_GM1330123889.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-afro-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-meme-stshirt-free_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/noclip-roblox-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-roblox-accounts-with-robux_GM431946152.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
font_00_sfnt_off00002b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3C 22056 bytes
SHA-256: d18b3391ae2319bb570593cc14bd4d210c0fafda680cef68c1c1e890c87edc74
font_01_sfnt_off00005c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0E 19652 bytes
SHA-256: d01fab7bff865e1e572a69531771b19011470ec9dd60cfeb54f37c62aa9fdbeb

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