Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78974407186a5d5…

MALICIOUS

PDF

36.2 KB Created: 2021-07-03 10:28:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a775c87b1d9a9a34a9610c072fdf2f47 SHA-1: 37fba99e03961f47984f13ff45f3b3c5acff5528 SHA-256: a78974407186a5d5c470d3db90b996752ceca2b60e7b469242cd8d1ea111f5d1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links designed to lure users into clicking on "free generator" or "hack" sites, which redirect to malicious infrastructure. The document body and embedded links strongly suggest a scam aimed at tricking users into visiting potentially harmful websites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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 http://netcdn.co/app/431946152/robux-hack-generator-game-hack In PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/roblox-speed-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/easytofindme-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/free-robux-kids-hack_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/how-to-get-free-300-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/smurf-backpack-gives-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/www-roblox-robux-hack-com_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/get-roblox-items-for-free_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/what-can-i-do-with-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux-on-kindle-fire_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/free-federa-roblox_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/how-to-ge5-free-robux_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/dowload-roblox-for-pc-free_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/como-hacer-hacker-en-roblox-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/free-faces-on-roblox-for-girls_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/cheat-engine-67-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-learning.man2jombang.sch.id/__statics/gudangsoal/files/free-robux-redeem-codes-generator_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
stream_002_off00003315.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3315 23692 bytes
SHA-256: 054dcc982fd87118b537c9052aed5021e2f96174f3db35720ce276e73662d74a
font_01_sfnt_off00006906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6906 18824 bytes
SHA-256: 6a2f4fb47bcac7a1427eb84fb186ae35d3638566a93e34d85c8a35338f058712

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