Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2d10d1a360d729…

MALICIOUS

PDF

39.5 KB Created: 2020-08-10 21:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d068112e7fb0f38d96d45bdd69c012f3 SHA-1: ec692c1141b55351e25ee486f1ba4ddd44a0a302 SHA-256: 9d2d10d1a360d72901696fe5ba9a46738c46528e6ab3b143205923c69deb18b2
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, with one specifically pointing to a known malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The ML classifier also strongly indicated maliciousness.

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=castes+et+races+pdf
    • http://matabokog.hypertubes.com/uploads/1/3/1/6/131606289/2794730.pdf
    • http://files.suyana.net/uploads/1/3/1/0/131070539/fepizimomuk_xibobofem_gaguzeligofuzu.pdf
    • http://files.ecooutpost.org/uploads/1/3/0/9/130969459/a3fca231b472f1f.pdf
    • http://files.thesuperbros.com/uploads/1/3/0/7/130739746/jiliwixeg_regojinavom_tabatilebe_puwugi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6397/files/zepokiwesarudijodimebode.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/buwanojaguvukaxajamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/wujunenopavamaburirogeroz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/gegoxowibaziratopix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/deguza.pdf
    • https://cdn.shopify.com/s/files/1/0429/3384/6172/files/assembly_language_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9507/files/pdf_bestand_comprimeren_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/gujujiluver.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/xarenugilaxezuzobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/pdf_split_and_merge_software_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/1534/7103/files/59226450292.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_off00005fd2.bin
24cfc9b70118436b927634044031aa93bdbca47489a5a454fc2384210afb1349
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD2 5024 bytes
font_01_sfnt_off000070ee.bin
32f46dd276e83d0d25bc9d67b0d8843f5832eab640af4d8f4980aca3187fe792
pdf-font-stream PDF embedded font (sfnt) at offset 0x70EE 9540 bytes