Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b0d4dcbd3d6302…

MALICIOUS

PDF

53.4 KB Created: 2021-06-11 08:32:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3f4828f968edabe0661c23cf86353b4f SHA-1: 039fc7a01f70107b9fd7246306cab178667fdf62 SHA-256: f3b0d4dcbd3d6302fb06032f6476a049757157bc5dcee6ed3aeb19af8e5538ce
180 Risk Score

Malware Insights

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

This PDF document employs a common lure of free in-game currency and hacks to trick users into clicking malicious links. The document contains multiple links to redirector domains and IP addresses that host further PDF files, suggesting a chain of malicious documents designed to exploit users. The ML classifier strongly indicated maliciousness, and the presence of redirector links and IP literals points to a deliberate attempt to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/free-roblox-robux-generator-2021-no-human-verification-scam-game-hack In PDF document text
    • http://183.91.70.11/repository/how-can-i-get-free-robux_GM431946152.pdfPDF link annotation
    • http://183.91.70.11/repository/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/animations-give-free-robux-robuxian_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-cheats-ios_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/hacks-for-mm2-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/pokemon-go-free-ultra-balls_GM1094591345.pdfIn PDF document text
    • http://183.91.70.11/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-stuff-on-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-roblox-pikachu-accessories-2021_GM431946152.pdfIn 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_off000053c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53C2 36152 bytes
SHA-256: d1ef5af4d562715d04273f8737d8766e05c530b3f73f73bf1065d54d54143461
font_01_sfnt_off0000a1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AA 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000ab58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB58 19336 bytes
SHA-256: b96fb4766b996b6087d39ac675463bdecfa34fbca92decf0f30a36d2a68e90de

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