Malicious PDF — malware analysis report

Static analysis result for SHA-256 796341812ae2b296…

MALICIOUS

PDF

47.6 KB Created: 2020-08-12 17:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b43687353ba75d2355ba416cbd32acb SHA-1: 1bbd1c18f5196486482a613761252054dcfdf72e SHA-256: 796341812ae2b2966bc30503b197544b33bdc548b5b864b65808b30180b91943
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent to redirect users to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=cartas%20desde%20la%20tierra%20pdf
    • http://files.millennial-pages.com/uploads/1/3/2/6/132682404/wowikepi-firow-ruvirob-navepapavufus.pdf
    • http://files.amillionmilesfromanywhere.net/uploads/1/3/1/4/131438541/e1ce4.pdf
    • http://files.hits-design.com/uploads/1/3/0/7/130776745/xepiwir_nemenuki_feval.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6880/8613/files/pisupepakivokuvutipezirux.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/37692308548.pdf
    • https://cdn.shopify.com/s/files/1/0430/1714/2433/files/wigezas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/simple_form_for.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/nutrition_assessment_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/15562373018.pdf
    • https://cdn.shopify.com/s/files/1/0431/6951/3632/files/65834762208.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/building_trust_in_the_workplace.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/34831125520.pdf
    • https://cdn.shopify.com/s/files/1/0431/2698/0765/files/gramatyka_angielski_szkoa_podstawowa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eb3.bin
72dfd50ff377bc5d8b2a0d53d081f085dc80a4fbdd0051eff0caff15243d4a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB3 4628 bytes
font_01_sfnt_off00007e7d.bin
70916deecd8cb3e8e721b7b1802d314b263eae42bf63254091e4059dacf98ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7D 10800 bytes
font_02_sfnt_off0000a1c0.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C0 4324 bytes

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