Malicious PDF — malware analysis report

Static analysis result for SHA-256 a523d5d653319503…

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 23:44:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 38793d54d4cb1154fad06638d20fd1cc SHA-1: 0ecb84d6dfcc07fca82154bc522d81383f6cd5c8 SHA-256: a523d5d653319503adb8c951cd8a6a04dcb002156abbf934db9319659e5c4ec8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to redirect users to potentially malicious websites, masquerading as game hacks and generators. The heuristic firings indicate a lure for free game items and a link farm, with one critical finding pointing to a known malicious redirector. No scripts were extracted, but the document body and embedded URLs strongly suggest a phishing or scam attempt.

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/lua-hacks-roblox-game-hack In PDF document text
    • http://www.hlad.hr/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-cheats-to-be-able-to-say-numbers_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-sign-for-homeless_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-phantom-forces-hack-level_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-phantom-forces-anti-cheat_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-without-builders-club_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-sue-roblox_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
font_00_sfnt_off0000318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318F 22396 bytes
SHA-256: be359171cc072ebd3879887acf7106d3c440cc5615448563cabcc3e5c02a3d2c
font_01_sfnt_off0000632b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632B 18796 bytes
SHA-256: e96f6e7db6188ad963ddc80f23805318ff70ca00e3ea42d2a35d6623d30108fc

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