Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1935d3ffa36c02…

MALICIOUS

PDF

47.9 KB Created: 2021-06-11 03:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4fed0dbddea5f521fe8c4c37ab1d01c7 SHA-1: 30c774d3c39600907e8aafa45cb07e5e3cbee9e3 SHA-256: 3e1935d3ffa36c0264134401b3abad6dec32ac9ecd47385626b8611076c30b40
180 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 Robux' or 'game hacks'. The heuristic firings indicate that these links lead to known malicious redirectors and are part of a lure to trick users into clicking. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to lead the user to a site that may host further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.tw/app/431946152/free-robux-no-human-verification-website-game-hack In PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/roblox-cheat_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/roblox-free-hats_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/how-you-doing-l2-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://www.shopinkart.co.in/uploaded_files/userfiles/files/coin-master-rewards-free-spins_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_004_off0000539c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539C 30332 bytes
SHA-256: 783e1ba9ab4fc6d756087d56afee1bd2bddf140bb7a13e86892423954f923d12
font_01_sfnt_off0000967a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967A 19056 bytes
SHA-256: 1f5cd08e9c1982e9e295e00574b662fc1f582a24920329e751bf6cc8e04ffb1b