Malicious PDF — malware analysis report

Static analysis result for SHA-256 033955059422582f…

MALICIOUS

PDF

38.5 KB Created: 2020-08-06 00:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0086ee009e542fcb9bd69931d98bd38 SHA-1: f178584b6278b6282bef5885c6d4ee6b1de9ac05 SHA-256: 033955059422582f99041ce1d0cd47a42134b1c0f95ca3b0eb9f642e405d4a21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/pify?keyword=jntu+b+tech+ece+syllabus+pdf', is flagged as a malicious redirector, suggesting an attempt to direct users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=jntu+b+tech+ece+syllabus+pdf
    • http://files.ohiomorganhorse.com/uploads/1/3/1/4/131437725/guxer.pdf
    • http://files.inspiredinksbymadeline.com/uploads/1/3/0/8/130813988/vonigijerugare_lazalam_jafusap_popaxuvisaxi.pdf
    • http://files.rockhillfarmersmarket.com/uploads/1/3/1/4/131452740/lidomaragovalepabug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/jokexidatebodobifun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/2020_volkswagen_cabrio_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0448/9786/1787/files/hsc_bm_all_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/lugumilirevisivovedan.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/8451492951.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/8371083331.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/minecraft_timber_mod_1._14.pdf
    • https://cdn.shopify.com/s/files/1/0440/7004/3813/files/95016985149.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/womubavez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/32495349487.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/mopubifofasita.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/80651104215.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/muwiseni.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_off00004c42.bin
ff44bd94ac83d41d1567d9f968236e7930398bbdcf997b737f7c3bdf9452f834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C42 5100 bytes
font_01_sfnt_off00005d9b.bin
71d6d5f80c059bf5e44a03bdb36140c85ab3c16641a714deb2edddbe32c88c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9B 9844 bytes
font_02_sfnt_off00007f4d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4D 4324 bytes

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