Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e20bef92802b60…

MALICIOUS

PDF

41.0 KB Created: 2020-08-25 19:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b6cb528283f127b1452eb407c5ca06 SHA-1: c2a67dc6aa365f97fb5959eee938e67a86b12918 SHA-256: d5e20bef92802b6053027562d0c25a32d03676016576529210af439d698b04ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.ru/pify?keyword=super+smash+bros+font', which is also present in the document body. The document's structure and the presence of numerous external links suggest a phishing or malicious redirection attempt, aiming to lead 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.ru/pify?keyword=super+smash+bros+font
    • http://files.circular-canary.com/uploads/1/3/2/8/132814387/123228.pdf
    • http://files.andreabrewtonphotography.com/uploads/1/3/1/4/131407665/nulebofulejeki.pdf
    • http://zoturiz.borkadancer.com/uploads/1/3/2/7/132740228/sapotewetusuv.pdf
    • http://files.davidfburke-art.com/uploads/1/3/0/8/130874063/wurukujojawore-tiropemejunizon.pdf
    • https://cdn.shopify.com/s/files/1/0435/6138/6147/files/fepaxozovexulod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/calendario_octubre_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/79761725193.pdf
    • https://cdn.shopify.com/s/files/1/0440/3727/5813/files/vururaritewufadowis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/tuvubadovivovop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/list_of_all_30_nba_teams.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/pulmonary_arteriovenous_malformation_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3017/6159/files/12599575163.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cd0.bin
b09197db1d5298312b599316713b0c3e3f07dcf3ef88b6a85a8c2f9dea19101f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD0 5352 bytes
font_01_sfnt_off00005edc.bin
c9fa060ee3679a8776e91b50ac29708ea47ce8d00a35cfae92eb136958550b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDC 10308 bytes
font_02_sfnt_off00008262.bin
fb27248ec02d804caa0ce6a8dd06a8f0f211157336bc50f6c382585ff5fe3da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8262 16084 bytes

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