Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac6beb8f57ecbb5…

MALICIOUS

PDF

43.8 KB Created: 2020-08-13 13:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d590be50732cc2e2e7b10bdfbfd4c2d7 SHA-1: ec47a9cf58d7f859f14f4ad2d115295846c6974a SHA-256: 7ac6beb8f57ecbb501cba47a0d89485ba237d36007e80a141e01c5879b629bb7
154 Risk Score

Malware Insights

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

The PDF document contains a link to a redirector domain, which is a common tactic for distributing malicious content. It also features a large number of embedded links to other PDFs, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user 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/wb?keyword=atlas%20of%20veterinary%20hematology%20pdf
    • http://files.thetracegrill.com/uploads/1/3/2/6/132682758/96512311a.pdf
    • http://files.kilgorecustomtattoo.com/uploads/1/3/0/9/130968942/rawudulukojonajolivo.pdf
    • http://files.hmonghistorycenter.org/uploads/1/3/0/8/130873851/labuniponunikefa.pdf
    • http://files.cdc-design.net/uploads/1/3/0/8/130813841/7705062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/genie_garage_door_manual.pdf
    • https://cdn.shopify.com/s/files/1/0444/1423/8887/files/1131881442.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/crack_abbyy_transformer_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/67346584844.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/49516124495.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/constituio_do_estado_de_alagoas_atualizada_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/causes_of_the_civil_war_webquest_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/3218/1909/files/social_psychology_kassin_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/vegesolek.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/57511902583.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/zulotopa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5365/2895/files/microsoft_sql_server_management_studio_2020_r2_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/zakinod.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_off00005f73.bin
592850fd6676769dce1c175eafee5f704b215bfec52f261c5554e7417d93c8a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 5396 bytes
font_01_sfnt_off000071a9.bin
6efebc1f100aecb1d768430192559d771a8d0a9a8bc2e930efe38deb26655945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A9 10260 bytes
font_02_sfnt_off00009407.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9407 4324 bytes

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