Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea6681e94ac7375…

MALICIOUS

PDF

47.1 KB Created: 2020-07-21 03:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1901e5e65b9e1c52a534ef261a8bbb5f SHA-1: f04441355a42c55522419ed166ea896776b1abfd SHA-256: 7ea6681e94ac73751f4af1970115e037961a38fb34ae5f73d93f1cbba021027e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a technical document lure related to 'Astm d638-10 pdf'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to distribute malicious content. No scripts were extracted, but the PDF structure and link analysis strongly suggest a phishing or redirection attack.

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/wb?keyword=astm%20d638-10%20pdf
    • http://files.sarahbaptistart.com/uploads/1/3/0/8/130874146/worobopefodov-butisobuzelu-xadeg.pdf
    • http://files.charityrugbyleagueday.com.au/uploads/1/3/1/4/131411199/zaroruxiw_zupopeze_deverupirogefa_fekitatiz.pdf
    • http://files.leslie-yao.com/uploads/1/3/2/6/132695405/3459780.pdf
    • http://files.superiormachineandfab.com/uploads/1/3/2/8/132815154/5810631.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/sajav.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/sumeturulozufanedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/titome.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/mowagemanefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38967404473.pdf
    • https://xoduwataneno.files.wordpress.com/2020/06/dibupatad.pdf
    • https://nafeneda.files.wordpress.com/2020/06/22060553428.pdf
    • https://juzorikum.files.wordpress.com/2020/07/75696227279.pdf
    • https://likulorasix.files.wordpress.com/2020/07/nuzobuwifoteborefud.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/ribezuzegofed.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/25022918011.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/70226405607.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/56383981636.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3508/2402/files/jesoraga.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/36370932617.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/xebujot.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_off00007330.bin
d1b8a440d135931262bc26a4286c69593897ad4a2b5685e9177302759db5e43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7330 4980 bytes
font_01_sfnt_off00008424.bin
d38c4fdd426cbbf1ca906c83b1469830efb63308a4f4adb87a6a3af461e2891d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8424 13484 bytes

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