Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e2f211af32f385…

MALICIOUS

PDF

35.9 KB Created: 2020-07-10 14:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f4a628e6095a7b6c2015e7f3d3939b9 SHA-1: fe7a2195119d48a83fd6707bd346444c0f0a55c4 SHA-256: 66e2f211af32f385f4cdb147643bc56fe1329df4033b47d93597e618dc16872c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as part of a link farm. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are part of this link farm, suggesting a coordinated effort to distribute content or manipulate search engine results.

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=surya+arghya+mantra+pdf
    • http://files.homeorganic.com/uploads/1/3/0/7/130739067/zoradewawab.pdf
    • http://files.savalotmovers.org/uploads/1/3/2/7/132741155/motamiredokidel_kigologidin.pdf
    • http://files.kulmschool.com/uploads/1/3/1/6/131606368/rinikipajamamo.pdf
    • http://files.insearchofbees.com/uploads/1/3/1/4/131405948/9851374.pdf
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdf
    • http://files.amandadixonlmhc.com/uploads/1/3/1/4/131454850/403142e03b1c.pdf
    • http://files.clubvaultitudetexas.com/uploads/1/3/1/3/131398252/wewofirinipabup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nopudup.files.wordpress.com/2020/06/77248658057.pdf
    • https://xidiseso.files.wordpress.com/2020/07/lugonozomulurejadefov.pdf
    • https://zufiwupaned.files.wordpress.com/2020/06/jiforajo.pdf
    • https://garuwade.files.wordpress.com/2020/06/bodeg.pdf
    • https://pubixof.files.wordpress.com/2020/07/17262515613.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/pesetenepijixeperav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8128296882.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/26969008938.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_off000050d1.bin
f2d753aacb6cf18deef3caaa29bebdb0687108a1dd1ecc0a9094e7cdb1983c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50D1 5056 bytes
font_01_sfnt_off000061d0.bin
860367ea9371c6f0f5001817ab0621f2091de6769e3bfc4afcdb96329b6b57bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D0 9612 bytes

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