Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f725387e3bbc28…

MALICIOUS

PDF

40.2 KB Created: 2020-08-07 19:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29fb13e01c64ae1972d9baa9fdf29a5c SHA-1: 21f7acac13aafe3e50d1651d6a5cb4581f08284b SHA-256: 56f725387e3bbc28e1e4a3c8f3ea2bdfc18d626b842aca773192d0db91904476
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=que+es+apriorismo+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted, limiting the analysis of further stages.

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=que+es+apriorismo+pdf
    • http://pedonem.flixtontennis.com/uploads/1/3/0/7/130775413/bab6cad9bf87c7d.pdf
    • http://vawitunin.kansascoringandcutting.com/uploads/1/3/1/3/131379732/74fbcdb07.pdf
    • http://files.lifeaftersemicolons.com/uploads/1/3/0/8/130814043/sewisibetarukebu.pdf
    • http://xavol.artichokegallery.com/uploads/1/3/0/9/130969762/994177.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/vonisi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/witcher_2_nekker_contract.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/professional_recommendation_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/67474897700.pdf
    • https://cdn.shopify.com/s/files/1/0439/4919/5419/files/coefficient_of_thermal_expansion_table.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/read_mockingjay.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/viruzovejaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/sozipuzuvusonetogexaxeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/52929717972.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4882/files/xumuzexugeropo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/determination_of_angle_of_repose.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8266/files/application_letter_for_loan.pdf
    • https://cdn.shopify.com/s/files/1/0438/8870/5688/files/40230833101.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/enzima_aldolasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/96582688078.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0a.bin
1c07f55e6a0bda65a4fe021a73a2579b611cb43d894bdae0f0920070509fac8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0A 5216 bytes
font_01_sfnt_off000070b2.bin
4596c9665bef6f7e080fa56fcd71c1f8761253b55c5e42245a239914616506cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B2 10360 bytes

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