Malicious PDF — malware analysis report

Static analysis result for SHA-256 135a6c09ed5b855d…

MALICIOUS

PDF

37.5 KB Created: 2020-08-29 22:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 594491a2978734ffa98ac5fd3ac45e8d SHA-1: ea04197d1e72869439010429a05311333d449444 SHA-256: 135a6c09ed5b855d324f8ef93e32ce895aa2d932ba6aca0b558d2a286a73ff3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Berserk the golden age arc 2 english dub hd'. This suggests a phishing or scam attempt designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.link/wix?keyword=berserk+the+golden+age+arc+2+english+dub+hd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_695ba211d7f043d898ec67f7cbd7a68f.pdf
    • https://static.usrfiles.com/ugd/dd4472_6850db36fcbb4c83aa0f98e6a1020bc6.pdf
    • https://static.usrfiles.com/ugd/26481d_d376463447e249b39e3c609550ed45c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_25b8f540408a48219d9e3c2ab14e0c74.pdf
    • https://static.usrfiles.com/ugd/b8c837_3788ef4b22f04e26b740a3afc9530709.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbca8c6e26074564ae006176727621da.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6870e46963c409fb85b4320f2f66eb2.pdf
    • https://static.usrfiles.com/ugd/52b593_b20fdf9c1a794519be3a957142434ead.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ebeff6d22b64ba38bece24d2a57c5aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_935f39ae9fc64dfdafd45904ef9bd08c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6f0b977dc9247cea333156a533e5899.pdf
    • https://static.usrfiles.com/ugd/b8c837_469bdc7996e2437d98cc89df968115a4.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/widejul.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6511/files/73738508879.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/16640755678.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5676577217.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004667.bin
e57f6290467ced5b0f4bb94cd13aeeaa1a5f478a88ac73d5d720edff29b71fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4667 5468 bytes
font_01_sfnt_off000058ed.bin
c96685c2ecb0c9297e27f945f527b4d41b5b93ce64c36063339185d7b352c238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 9812 bytes
font_02_sfnt_off00007a89.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A89 4324 bytes

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