Malicious PDF — malware analysis report

Static analysis result for SHA-256 0495b9f439f56154…

MALICIOUS

PDF

44.7 KB Created: 2021-05-15 10:40:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9a78f03646a805fa5b0b0b8bcb5c48e2 SHA-1: e405ea15947eea166c4e2465ca67a5181779edb1 SHA-256: 0495b9f439f561544c7660a33356c995829484c27cb85962a774a9bba5e5924b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors, specifically designed to lure users with promises of game hacks and free currency. The ML classifier also flagged this PDF as malicious with high confidence. The document body and extracted URLs strongly suggest a phishing or scam attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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.
  • 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/406889139/spin-links-for-coin-master-game-hack In PDF document text
    • https://mbbs.hr/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-fan_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-spins-ios_GM406889139.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_off00004900.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4900 24836 bytes
SHA-256: 491d9f713b3ad3654f88857db6a35be12179fa11294ffbdb78e6e6571599fc12
font_01_sfnt_off000081cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CC 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00008cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD0 18056 bytes
SHA-256: 578cb632d29792d27323dbfb8f8c4e13070323ba88199216771f9de5c0a4a85a

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