Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcc22494b919d6b…

MALICIOUS

PDF

45.0 KB Created: 2020-07-09 06:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc3f6f6cf9a9f09c54f4f6886767dde7 SHA-1: 67388b580ef58737be400557779ceb9ec160ec0e SHA-256: 1dcc22494b919d6bf308f4239951b04c92f7b4ec9601418e08b9fbffee945051
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to a malicious redirector and numerous other PDF files. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL further supports this assessment. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector is the extensive use of malicious links.

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/wp3?keyword=kenneth+goldsmith+wasting+time+on+the+internet+pdf
    • http://files.usydfoodcoop.org/uploads/1/3/1/3/131398246/a371099d3.pdf
    • http://files.nod-production.de/uploads/1/3/0/7/130776118/3864674.pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://files.ivexpo.com/uploads/1/3/1/3/131383325/231e779.pdf
    • http://files.sbcopywriting.com/uploads/1/3/2/7/132740218/644292.pdf
    • http://files.atlantaillinois.org/uploads/1/3/1/4/131482828/f10a2.pdf
    • http://files.saikmusic.org/uploads/1/3/2/7/132740415/67c8893d65fe7.pdf
    • http://files.standrewsmeriden.org/uploads/1/3/2/6/132696155/mitipujesilog.pdf
    • http://files.egmmsmedia.com/uploads/1/3/1/3/131379680/ec0b578e4ba45.pdf
    • https://xuvabogov.files.wordpress.com/2020/06/piwobiwemerobugikoj.pdf
    • https://xekomuzow.files.wordpress.com/2020/06/84387109042.pdf
    • https://jumupetilik.files.wordpress.com/2020/07/17377258567.pdf
    • https://jaxevugem.files.wordpress.com/2020/06/tasomekedakisutow.pdf
    • https://pomurulive.files.wordpress.com/2020/07/38318394979.pdf
    • https://wufubupaku.files.wordpress.com/2020/07/xebupu.pdf
    • https://puxujirifu.files.wordpress.com/2020/07/86690187350.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb9.bin
eff4c56bb13e5e51525f3bf34ff08a38de23ca58a82eaba618507df57a0206ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 5304 bytes
font_01_sfnt_off000081aa.bin
60170f730909b8f93f6fbe3bd7f3c24cb3f2c156b94795c6745e5cba182b3530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AA 10876 bytes

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