Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a3cf16e257516f…

MALICIOUS

PDF

49.7 KB Created: 2020-08-28 16:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2af100410777383d075f707f73257b SHA-1: fd4dd6aab623fd101f0409a398c30436734f3449 SHA-256: 06a3cf16e257516ff23947a14597d2021ae7a28468d0754d3a16dfec268f1be3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that matches the malicious redirector found in the heuristics, suggesting an attempt to direct users to harmful content.

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=tipos+de+eslabones+mecanismos
    • http://files.eunhongkang.com/uploads/1/3/1/4/131407148/lewimulil-makusi-zomaxud.pdf
    • http://files.southcentraldallasbpwc.com/uploads/1/3/0/8/130813409/846043.pdf
    • http://files.windsweptgoods.com/uploads/1/3/0/9/130968926/mowinubavaket.pdf
    • http://files.dawnsgoddessdiaries.com/uploads/1/3/1/4/131453934/f1e9f.pdf
    • http://files.andreaclarkend.com/uploads/1/3/0/8/130814636/zobul_gajupisix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2348/2535/files/apa_style_research_paper_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/87984400274.pdf
    • https://cdn.shopify.com/s/files/1/0431/0283/0745/files/casio_dlp_projector_manual.pdf
    • https://cdn.shopify.com/s/files/1/0444/3258/8966/files/altium_designer_17_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/4171/0499/files/livros_sobre_alimentao_saudavel.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0933/files/57697506620.pdf
    • https://cdn.shopify.com/s/files/1/0436/9347/3947/files/37088823487.pdf
    • https://cdn.shopify.com/s/files/1/0435/7183/9135/files/decimal_worksheet_for_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0436/4209/3728/files/nuroputapediniputuwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9242/7430/files/3834580768.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/110481060.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_off00007590.bin
1c7533004ebce2a37d859791a1c371cb07c8f36e3bd761069a14ac251a3a1b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7590 4920 bytes
font_01_sfnt_off0000861a.bin
cd6deb310344990424c4fa67b0f7ffbf6ed877ada72e5f63f12e2a29fd207f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861A 11364 bytes
font_02_sfnt_off0000aa3f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA3F 4324 bytes

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