Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff3660bd187ae1b…

MALICIOUS

PDF

41.2 KB Created: 2021-05-12 20:03:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 100738f5613cd7ac538f110ad4c717af SHA-1: f743c75b543aad4d72da3a6826c0a48112afa2f3 SHA-256: bff3660bd187ae1ba890845e6337930f4b250923e38d166cd323e66f4d6a05ae
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them for game-related cheats or currency. These links redirect to malicious infrastructure, specifically a known malicious redirector. The document's content and structure strongly suggest a phishing or scam attempt, likely distributed as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-spins-coin-master-hack-game-hack In PDF document text
    • http://www.barkas-n-i.gr/images/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.barkas-n-i.gr/images/promo-codes-for-free-robux_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_off000049d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49D6 24008 bytes
SHA-256: 163c5ac5fa5972cef1bea2532c2e17160f1724d54fad0f5e588331e82d5622cd
font_01_sfnt_off00007f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F87 18056 bytes
SHA-256: 80aa601e39d75fb74aea55068656967f8eb3655b97589a2d3c4253cef7ecc220

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