Malicious PDF — malware analysis report

Static analysis result for SHA-256 181eae97694f99d4…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 07:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6274a93b3b8f7900f522ae592dfe023f SHA-1: 4db4bae76f48687e7638c630455a033655b8d72f SHA-256: 181eae97694f99d41427fcf252f532c811d0fd8060d561698f1f375c4c3e0dbe
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game items and currency to trick users into clicking malicious links. The document contains numerous links to redirectors and a link farm, likely intended to lead users to phishing sites or further malware. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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/406889139/coin-master-free-coins-2021-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/how-to-egt-free-items-roblox-email_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-free-robux-scam_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/cheat-codes-on-roblox-xbox-one_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-cheat-speed_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/are-free-robux-real_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-codes-2021-for-phone_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hacking-brothers-roblox-account_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/can-you-hack-for-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hack-money-granny-roblox-v3rmillion_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
stream_002_off000030c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C2 23364 bytes
SHA-256: cf814932efd97c07e61a714b0904f91542451ff641b28a7c4c2cb608c43ec763
font_01_sfnt_off00006564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 18400 bytes
SHA-256: 0cc69a54ece3ed14f72d45612a229cad946be49a09675100e3633ee455bac280

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