Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31f5d4526d4881d…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 13:28:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ac769f1af97759bddd609ffea97f13e8 SHA-1: d5f524e7c4d1db93192b9b4e8727fa1c5524115c SHA-256: b31f5d4526d4881df82d43cb9ba271db1fafe4690ce3e5247aa6de4e58441206
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'game hacks' and 'free currency'. The document body and heuristic firings indicate a lure to click these links, likely to download further malicious content or lead the user to a phishing site. No scripts were extracted, but the embedded URLs and the nature of the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.tw/app/431946152/how-to-get-free-dominus-and-robux-game-hack In PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/flying-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/kristjon-15k-robux-reward-hack-tutorial_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/theme-park-tycoon-2-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/can-i-get-roblox-hacks-as-a-google-extension_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/lego-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/how-to-use-cheat-engine-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/arcane-legacy-hack-roblox_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/free-robux-codes-september-2021_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-website_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/free-robux-mac_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/hack-roblox-exploit-wearedevs_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/roblox-mmc-zombies-project-hacks-script_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/roblox-dragon-ball-rage-hack-script_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/how-to-make-clothes-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://vissalutis.pl/wp-content/uploads/fsqm-files/how-to-get-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
stream_004_off0000527c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527C 28128 bytes
SHA-256: 8d0bd37d19ace2fc99ca603ab16e730e6a81a5647cbc4f9457a50ba6ff2773ec
font_01_sfnt_off000090c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C9 19004 bytes
SHA-256: 141e05db6ac7d836179a8537d6b811deb10bb9a3de8b5c15e8c92c1d0aa88a9a

Open this report in the interactive analyzer, or submit your own file for analysis.