Malicious PDF — malware analysis report

Static analysis result for SHA-256 78505a6f0cb84def…

MALICIOUS

PDF

46.7 KB Created: 2020-07-25 11:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bad6331e23044eb3c964d0c931762027 SHA-1: 6adbc5aa98b8fa4ffd9eaac5dda0dfe6ae1f23e0 SHA-256: 78505a6f0cb84def27514355c1a4ff0bc493baf04bec0253d0c045ed823df7a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with a critical heuristic identifying it as a malicious redirector link farm. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be directing users to potentially harmful external sites, indicated by the high number of PDF links and the presence of a redirector URL.

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=assetto+corsa+car+pack
    • http://files.ruthbrambleceramics.com/uploads/1/3/2/6/132682561/nipafupoxurupuk-zixiru.pdf
    • http://files.portlandumc.org/uploads/1/3/0/7/130739210/kazevagemuresisafo.pdf
    • http://files.halldavismarketing.com/uploads/1/3/0/7/130739060/3d88c12.pdf
    • http://files.slgtc.net/uploads/1/3/2/6/132681398/824058.pdf
    • http://files.alfredschipsandsalsaexpress.com/uploads/1/3/0/7/130739158/7d5a8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0819/5735/files/xaxira.pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/96578157932.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/majokakasopumomeset.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3041/files/benot.pdf
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/bojizumesurupidoroxoroj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/lituxatonejerukijatuwovew.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/4238304407.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/78636638332.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/4006966298.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70686619693.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/91285001745.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/soxewovima.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/24636469773.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_off00006f94.bin
5ad138dd5264e1668c2e23e5b3126d0ff0ef6d798fce4fc9ed0f3aac213a848f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 4584 bytes
font_01_sfnt_off00007f32.bin
348d818cf071a6cfbd3c84b907461f03a67616b7f41a1bd3f7c510558bf97ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F32 15008 bytes

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