Malicious PDF — malware analysis report

Static analysis result for SHA-256 698e1e66a3a43376…

MALICIOUS

PDF

33.8 KB Created: 2020-08-20 00:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a926f960bd09fe0939922f9a3cbbab2 SHA-1: 32396acae7f781cfbd93c016132b63ea2e12b21f SHA-256: 698e1e66a3a433768ed2ce3510bf90d7d153b1c066ce2e5de8f6978fe13256f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one pointing to a known malicious redirector and many others forming a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded links suggest an attempt to drive traffic to potentially malicious or SEO-abused sites, rather than a direct user-facing lure.

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=ible+suffix+worksheet
    • http://femopamo.scotsresearch.org/uploads/1/3/1/4/131437425/47090.pdf
    • http://files.saikmusic.org/uploads/1/3/2/7/132740415/67c8893d65fe7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/pikukaraxarilolujexom.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/forenuwumuduwise.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jeravutudab.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3493/files/gazusofutezubosonivuxuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/womazavegarebasoxifun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/43737318054.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/siroti.pdf
    • https://cdn.shopify.com/s/files/1/0436/9815/9769/files/maryland_bridge_prep_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/shutter_count_canon_6d_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/geletowugutetarap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/xixotefavuruwegoxoxilosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/14669441719.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/cerebrito_libro_de_formulas.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_off00004837.bin
6a79d914e5b84124756a4c06e97685e96ec602d3d623647fce57bdaddf715578
pdf-font-stream PDF embedded font (sfnt) at offset 0x4837 4944 bytes
font_01_sfnt_off00005915.bin
586ab5390410ad2be1fa08472b7fb536373e46e0930f493aca26ff4f18907c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x5915 9836 bytes