Malicious PDF — malware analysis report

Static analysis result for SHA-256 79acaf7b5b82665e…

MALICIOUS

PDF

44.7 KB Created: 2021-05-15 22:31:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c46021ad8c5ebab666d18984c6d74e73 SHA-1: 33fc96847dee8eb6997380f037ea341b0a6d238a SHA-256: 79acaf7b5b82665ec624b452cf0c2a79797363d35ae9727d15196188118e286a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to trick users into clicking malicious links. The document contains numerous links to redirectors and link farms, including a primary link to 'free-robux-no-human-verification-or-survey-2021-game-hack'. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam campaign, likely initiated via a spearphishing attachment.

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 https://netcdn.xyz/app/431946152/free-robux-no-human-verification-or-survey-2021-game-hack In PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/robux-miner_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/oprewards-login_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-free-spins-link_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
font_00_sfnt_off00004c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C35 26808 bytes
SHA-256: 21557a6c4ccddd171c4aa20e327d838d3e0ab23529b371556d617645329757c5
font_01_sfnt_off00008880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8880 19556 bytes
SHA-256: 08b2a18d96b3566ec838f0e87c4bb916e955b8f8af04b9064418114d078945b8

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