Malicious PDF — malware analysis report

Static analysis result for SHA-256 02aac07a11d1173b…

MALICIOUS

PDF

44.1 KB Created: 2020-08-11 21:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7264a1419e655bd87eacb81d21f9bf0b SHA-1: 0ce8690a6db1b05601514fa8f16092e2cf3c3070 SHA-256: 02aac07a11d1173bd2946029a81eab36845edbf79eef4009b7717ea93f0b967a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a book summary. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests a link farm or SEO abuse tactic.

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=summary+of+anthills+of+the+savannah+pdf
    • http://fetom.pecanstreetchristianschool.org/uploads/1/3/0/7/130775062/8387156.pdf
    • http://files.twolazylittledogs.com/uploads/1/3/0/7/130775583/ac9de9ed.pdf
    • http://files.animalecologylab.org/uploads/1/3/1/6/131607683/popategajuf_xanodexafavum.pdf
    • http://desavopo.archaeoacousticsscotland.org/uploads/1/3/1/6/131637047/fuluwez.pdf
    • http://files.reneejackman.com/uploads/1/3/0/8/130873794/41f95bdb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2585/8723/files/40750665118.pdf
    • https://cdn.shopify.com/s/files/1/0434/7409/2196/files/farikukusoxekuji.pdf
    • https://cdn.shopify.com/s/files/1/0440/6404/7269/files/baroque_music_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7529/files/tokadixesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/60888814244.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/dofudubizofibojumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/gulikanexowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/vebafusiwowuzovajuvixo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/94197727469.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/fixepevokez.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/37391867343.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/mavuwamanuninoguvej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/74565938793.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_off00006e47.bin
e01f2dcc77f69a9c88a19609f5bd55319fa5b72ab9938952cae11c0ee50b092b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E47 5544 bytes
font_01_sfnt_off000080fe.bin
388bc21a2b770c6e173a950cad87abf2f5f7b8ed68b93978f4a7652b54599e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FE 9876 bytes

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