Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e463cf991f906d3…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 11:59:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 716c77a5b6f372c9a56dee4264654320 SHA-1: c7f84051a4b2c3b2048e63cab2402f7add5b5c29 SHA-256: 0e463cf991f906d3a8616a7bdac5afbcdf35f4fa497e1b902416e5726afff91b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that appear to be part of a link farm, with a primary URL leading to a 'game hack' lure. The presence of numerous links and the 'SEO Link Farm' heuristic suggest a campaign to drive traffic to potentially malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a social engineering tactic to redirect users, likely as a precursor to a further payload or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/how-to-earn-robux-by-playing-games-game-hack In PDF document text
    • https://www.insol-europe.org/uploads/files/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-generator-without-human-verification_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_004_off000052c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C5 24616 bytes
SHA-256: 9212b150db2358d1dc2c95c10d8f51d40c8233f1354d3e2af6d085643630acb7
font_01_sfnt_off00008b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0C 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00009537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9537 19320 bytes
SHA-256: a1584dac0915afffe374fd321a91a63158f116b97d599b0b15246117d282c726

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