Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd6a6df249f72a0…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 00:50:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5f07d6c342a92041813ff7e5a524ec0e SHA-1: 9d10cce3d917f7b06d8d47105b4742787427365c SHA-256: 5fd6a6df249f72a0d14d945f5979945b111229cbdaab75f439e1e10ef98ffaa2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/free-bedrock-minecraft-game-hack PDF link annotation
    • https://sensorcamera-tw.com/upload/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-pokemon-cheats_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-jailbreak-speed-hack-codes-2021-augest_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-cheat-speed-run_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-cheat-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-hack-download-no-verification_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-pastebin-youtube_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-win-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/a-free-robux-site-that-actually-works_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-free-robux-on-roblox-without-human-verification_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-get-any-item-in-roblox-without-hacking-2021_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_off000030d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D1 22508 bytes
SHA-256: 21b2a01fb5a72618954c82da6acae430a459914dac2ba928682cdbb4954448e4
font_01_sfnt_off000062e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E0 18560 bytes
SHA-256: f19a021a5d941007fe09e9c971895504ffbc3319a114e02b8297ae24bc05196b

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