Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b32fe0bd8ae1dfa…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 12:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 065dbf4bc5463ed21ff5f6b346c181b3 SHA-1: 1f3376d32df0a3df3f2e88d870d86164b84a8466 SHA-256: 6b32fe0bd8ae1dfa3cc934facf1285f820a3a7d522237421f0aee7c680ddb441
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure to install a flash plugin, which is a common social engineering tactic. The presence of numerous external PDF links further indicates a link farm designed to distribute malicious content.

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.com/pify?keyword=install+flash+plugin+chrome+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_608f256606fc4cddb6c01466de91364c.pdf
    • https://static.usrfiles.com/ugd/19103d_9d5dcdd9d5ba48aeaa33bf7584d602f9.pdf
    • https://static.usrfiles.com/ugd/e3c460_c2c108f2d16b41f7af98286a7de5b903.pdf
    • https://static.usrfiles.com/ugd/ab0441_100861fbd9f44e7897d4af6a251dd20b.pdf
    • https://static.usrfiles.com/ugd/912de2_68aa4c8ee46844a6b578a96ab10dad53.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0ac459034d44cfb887ca47771c862cd.pdf
    • https://static.usrfiles.com/ugd/87fdc7_69736fe3df934248b71e5c8b13e0f827.pdf
    • https://static.usrfiles.com/ugd/eb6612_5c7cb8df593940bcb1f8a5cea73ab696.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b60954656eb4c149fba766bfe93ab8f.pdf
    • https://static.usrfiles.com/ugd/432b07_8df4e984a44e4e13822ab980ce24764a.pdf
    • https://static.usrfiles.com/ugd/b8c837_54d4cf8d3a224de9b0cee851fed2f3e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d92dd37c3518400786591cc6da3b1405.pdf
    • https://static.usrfiles.com/ugd/b8c837_997ebf8bdaa548cc8b422560fa829eba.pdf
    • https://static.usrfiles.com/ugd/529dbf_a082aaaa833a4e01908d1b4ecceafa7a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dc5.bin
ea634c3c70891e715506acfb3053532138c717c9fb700eb5f329421f1d252435
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC5 5504 bytes
font_01_sfnt_off00008054.bin
2489d7d1bc55d18023a077df61a99ac528403427d88a3abf5991d41610940d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x8054 10272 bytes