Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6f5dddd8c01f2b…

MALICIOUS

PDF

44.2 KB Created: 2021-06-04 02:18:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f591308815375f21d9be75627dd9b3a9 SHA-1: e43d0b2c034ebf087c2d183820dfd6311c6d3878 SHA-256: af6f5dddd8c01f2b55b711ef3e355bd42e4e072c62037da414e5ab0e454b7b0b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to appear as free game hacks or generators, directing users to malicious redirector infrastructure. The document body and heuristics indicate a lure for potentially unwanted content or further malicious downloads. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest an attempt to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/free-coins-for-coin-master-game-hack In PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-a-free-raid-pass_GM1094591345.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-coins-2021_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
stream_004_off000053a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A0 25112 bytes
SHA-256: f68dc54f11e2f517c9c079a1255e80680491a8c3289e3fdb9ccba1070f000cc6
font_01_sfnt_off00008be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE9 17712 bytes
SHA-256: fd51fa1b849cf95139b510f282bcd47e41e352499df1938c7ca947a320e7b070

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