Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad8a6da48ab855d…

MALICIOUS

PDF

45.0 KB Created: 2021-05-15 09:03:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 208c822646d21e0931c7bd6b7af8fb88 SHA-1: 845fcde8abfd852f00c3be58f60ee0a69703f116 SHA-256: 8ad8a6da48ab855dd3fe712d99aac646991fca2dbf443e68e06c84b2e792d337
228 Risk Score

Malware Insights

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

This PDF document contains multiple links to external websites, including a primary redirector at `https://netcdn.xyz/app/479516143/minecraft-tower-defense-2-hacked-game-hack`. The document body and heuristic firings indicate a lure for game hacks or free items, designed to trick users into clicking these links. The presence of numerous PDF links suggests a link farm intended to manipulate search engine results and drive traffic to malicious or deceptive content. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/minecraft-tower-defense-2-hacked-game-hack In PDF document text
    • https://servotecnica.com/images/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://servotecnica.com/images/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://servotecnica.com/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://servotecnica.com/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6A 24420 bytes
SHA-256: b0713d5dbbec0de3aac5dccc0a48ff2d70e86b4b8b2902933caab315e3d748d2
font_01_sfnt_off00008281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8281 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00008c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6B 18508 bytes
SHA-256: dfa7fded366e42e453bad8f972622469f3be5fd523f8d87af1dd357da012015d

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