Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e3331ac4805574…

MALICIOUS

PDF

53.2 KB Created: 2020-08-08 17:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c0ad8450de2ff646b2dbf188eb04b4 SHA-1: 7dccc94385ecca8e9de635cfc1f272d89dc8d3bf SHA-256: a9e3331ac48055742c337592e37e8ca1ae006b9ab8a3acb99c7f13e491698819
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to a 'chemistry book for high school pdf' and the malicious URL, suggesting a lure. The ML classifier 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.com/pify?keyword=chemistry+book+for+high+school+pdf
    • http://files.jessicafrancisphotography.com/uploads/1/3/1/8/131857916/navasamekuwur-xikuzukavak-zowifev-noduli.pdf
    • http://files.myperformingarts.org/uploads/1/3/1/4/131453998/todiwunozix.pdf
    • http://files.erasmusbyprimerasupport.com/uploads/1/3/0/7/130739081/62eb6b401d.pdf
    • http://files.emorylanedesigns.com/uploads/1/3/1/3/131383580/8885572.pdf
    • http://files.jewelconsulting.net/uploads/1/3/2/6/132696018/kopadafunidogoli.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0124/files/nijuvubeposeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/ejercicios_resueltos_de_nomenclatura_de_alcanos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/rexuvisowilof.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/apology_language.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1966/files/hp_application_lifecycle_management_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/microbiology_dictionary_english_to_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/the_architecture_of_the_city_aldo_rossi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7598/3778/files/sunelebifabedobodeseb.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/47348592885.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/calendario_serie_a_sky_dazn.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/voduwonudovakaka.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7058/files/22856664916.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_off000091e9.bin
b7cd7c9d91b9337eb9816d4822c5178be7f64da132f61e3378f2232b409bf269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E9 5572 bytes
font_01_sfnt_off0000a4b7.bin
4144004bdb098e5c31a50902751b4d5cc06cd3e5fc07028d6a033b570b910c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B7 10120 bytes

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