Malicious PDF — malware analysis report

Static analysis result for SHA-256 722be2ce565832a9…

MALICIOUS

PDF

34.6 KB Created: 2021-07-08 07:55:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ca2d9dd01f45e4532afeb387eacaf9fe SHA-1: 1804ee5c68ff95f7d9421c8ec82dd64a5d7163b4 SHA-256: 722be2ce565832a94d8905f4ee250c343e3a40caa31c435d50a8c717c4699f8b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a primary redirector at http://netcdn.tw/app/431946152/complete-offers-for-robux-game-hack, which is designed to lure users with promises of free game currency or hacks. The document also features a large number of links to other PDFs hosted on hlad.hr, suggesting a link farm for SEO manipulation or further redirection. The ML classifier strongly indicated maliciousness, and the presence of these lures aligns with common phishing and scam tactics.

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.tw/app/431946152/complete-offers-for-robux-game-hack In PDF document text
    • http://www.hlad.hr/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/the-hacked-familys-basement-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-free-robux-hack-code_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/pokemon-go-free-versus-pc_GM1094591345.pdfIn PDF document text
    • http://www.hlad.hr/files/robux-xyz_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-pet-simulator-how-to-get-a-free-dominus_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-games-that-work-2021-no-password_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/hack-jailbreak-roblox-2021-cranberrye_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/hacks-for-roblox-admin_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-scripts-roblox-voidacity_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/my-ex-boyfriend-cheated-on-me-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-lua-scripts-for-cheat-engine_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_off00002f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3F 22704 bytes
SHA-256: 812f593736df8f84554685b23d67c2d8d41503f4922bc4820117bdb26c7646d7
font_01_sfnt_off00006172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6172 19332 bytes
SHA-256: 4d9ba5d453d99a2070cb758231aeac466e4ae09db5fcec1b276eb87b14b4c5aa

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