Malicious PDF — malware analysis report

Static analysis result for SHA-256 423fd366be880c5b…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 08:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bf2061dabba7ded6cbe2230c4d4823f SHA-1: 607b386199c777a61c7171c8197eff518eb7e9e1 SHA-256: 423fd366be880c5b2148d1ce6dce114d9bfe2cb64568753ab5260ebd104bcb20
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'captain underpants free ebook' and a URL that matches the redirector link. This suggests the document is a lure to redirect users to malicious content, likely for phishing or malware distribution.

Heuristics 3

  • 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.
  • 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://ttraff.cc/wix?keyword=captain+underpants+free+ebook
    • https://cdn.shopify.com/s/files/1/0440/4455/0294/files/buscopan_iv_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/dunebel.pdf
    • https://cdn.shopify.com/s/files/1/0462/7746/0128/files/gatasuwupapegodonem.pdf
    • https://static.usrfiles.com/ugd/b8c837_cda37eaa1d2243e7ad204dc883723ec4.pdf
    • https://static.usrfiles.com/ugd/2813e2_370451feec83451b9962c51ebd7e8cdf.pdf
    • https://static.usrfiles.com/ugd/8ab72e_e7f558bf59064489ad08c1e024f5c208.pdf
    • https://static.usrfiles.com/ugd/b8c837_60427313b8fc48bea578d7add9820f02.pdf
    • https://static.usrfiles.com/ugd/1a89c8_646c70cdfc484c4e8f6691fa7eeb61be.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ec9cfcc516241eb91aaee5f9f0ea4fd.pdf
    • https://static.usrfiles.com/ugd/e3c460_c03f0ef13c474af5aee5156b93020629.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004208.bin
92316abe1142f22d23d1d3054e80b912ec098856c489ad4e2023d77cbd967add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4208 5112 bytes
font_01_sfnt_off0000536d.bin
dffeb03f47a312ce498a36930cfa320fd268772e28d7b50a2158b6bf70766175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x536D 14144 bytes
font_02_sfnt_off00008017.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8017 4324 bytes

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