Malicious PDF — malware analysis report

Static analysis result for SHA-256 3520844decf00740…

MALICIOUS

PDF

50.4 KB Created: 2021-06-03 06:10:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da05c672325d449cf325db543a0f70fa SHA-1: 877a28444728ddc3a4d3f4a83b330354a730e490 SHA-256: 3520844decf0074060dc88303f9eeff180ea874b9fea9a5fb566cb12fe4ab403
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that appear to be part of an SEO link farm, designed to attract users searching for game cheats or generators. One critical heuristic identified a link to a known malicious redirector infrastructure, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a social engineering tactic to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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/coin-master-games-download-free-game-hack In PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/oprewards-robux_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/robux-converter_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/village-4-coin-master_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/easy-roblox-today_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_off00005629.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5629 27672 bytes
SHA-256: e3585b5ba8568a03d1508c178c5dabb973a5d0362d5aee930fd44bb13dd3e30f
font_01_sfnt_off00009509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9509 3620 bytes
SHA-256: a7ffd47631dfdffd19913a7d019e14a4e4f6584a4e894343a0be0687632311e4
font_02_sfnt_off0000a1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CC 18548 bytes
SHA-256: bf0010eea28238cadeb536793d42f80382de1e22dde51f6e5fd1d23f73abc266