Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8c2b9dee498560…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 11:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1302548432888155c4f099954f5f3fe SHA-1: ee446cd0e4b3d8599f9da6da8d367e6b1d716453 SHA-256: 0c8c2b9dee498560ce22e53804195f2b0c72eee09589a4a25959b231f9e87005
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Occupational safety and health journal pdf' and the malicious redirector URL, suggesting a lure to disguise the malicious intent.

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/pify?keyword=occupational+safety+and+health+journal+pdf
    • http://jisegiza.oletownaussies.com/uploads/1/3/1/8/131871871/9935244.pdf
    • http://files.mountainairdance.org/uploads/1/3/1/4/131437532/1947269.pdf
    • http://files.greenearthtravel.com/uploads/1/3/1/4/131438071/wutopalowes-mofosipifikafil-munuvepepiri-pemubadula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/gowupo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/kivalid.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/barag.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/73923364222.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/dolivujesizozulowemerojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/45801145010.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/10858255690.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/support_vector_machine_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/70363450449.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/12346555078.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9819/files/towipazifevetafel.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/42154586852.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_off00006c26.bin
0cfb8fbd8f6ede101684b5c4b7d37cb899f9a5cf5e4b9bc07bcc3b1a68e1bca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C26 5448 bytes
font_01_sfnt_off00007eaf.bin
ebe60e9e8049bad0791456f3e75979a00ac9c3833210ce5b15c66cef33cd1075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAF 10108 bytes

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