Malicious PDF — malware analysis report

Static analysis result for SHA-256 c479fd430319df23…

MALICIOUS

PDF

51.9 KB Created: 2021-06-07 20:16:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: da932b2765ff3c7ae27d2d1651fd9da3 SHA-1: 13a0cb99da0983468ca0fe05fa7909742fa08b7e SHA-256: c479fd430319df23ed03554f2cda806d32de0307d4c7e56b05ce21fdb6f70eea
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free Robux, indicating a lure for users to visit potentially malicious sites. The heuristic firings confirm the presence of malicious redirectors and a link farm, suggesting the primary goal is to drive traffic to these sites. No scripts were extracted, but the document structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.tw/app/431946152/roblox-jailbreak-telport-hack-game-hack In PDF document text
    • https://sanjoseelectricians.net/images/this-skin-cobonation-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-hack-lola202198-roblox_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/hack-roblox-electrick-state_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/denisdaily-hacking-in-roblox_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-hack-your-old-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-hack-roblox-client_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/does-john-doe-hack-roblox_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/cheat-in-roblox-dragon-ball-z-final-stand_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/free-money-hack-roblox-vicholsimlotor_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-get-money-on-roblox-with-cheat-engine-63_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/comment-hacker-jailbreak-sur-roblox-2021-mops-games_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-do-you-finish-getting-free-robux_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-be-thanos-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-hack-de-robux-version-2335202112-apk_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-hack-money-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/indidojoe-robux-hack_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-jailbreak-volt-bike-free-other-game_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-get-free-roblox-real_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-robux-pastebin-hack_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-get-a-free-roblox-group_GM431946152.pdfIn PDF document text
    • https://krnl.rocksIn 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_off00005378.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5378 31696 bytes
SHA-256: 89331d4eddbff4b6d5c7672d9dd7288518f5ae89a1da08921e51167b482c771e
font_01_sfnt_off000099c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C8 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D9 18748 bytes
SHA-256: 87b84c04adf793ab9abb6084136040181c5cc8003dc95580eef5bc9b9c3df3c3