Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d582abebff9aa9…

MALICIOUS

PDF

38.4 KB Created: 2020-08-05 13:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89d9466932c2d2694e51cd64abfd8d3b SHA-1: ec202c23f336fd9a697c25e4bdb79259cdc8f130 SHA-256: 63d582abebff9aa9ea7d28cbca25a44b92ae0fe389cebc3237c9575558b55534
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'bioassays with arthropods pdf'. The presence of many external links suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=bioassays+with+arthropods+pdf
    • http://files.culinaryabstraction.com/uploads/1/3/1/8/131857818/palanozeredewipasab.pdf
    • http://files.giftedsupportnetwork.org/uploads/1/3/1/4/131453097/4810043.pdf
    • http://files.taaonline.org/uploads/1/3/1/8/131856285/c5bed6fa80c566.pdf
    • http://xesoz.hollywaightdesigns.com/uploads/1/3/1/3/131380005/1131750.pdf
    • http://files.jpsediting.com/uploads/1/3/1/3/131379477/welavure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/94791864457.pdf
    • https://cdn.shopify.com/s/files/1/0435/1570/7551/files/67704229039.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/60420241322.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/merge_mac_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/nusegigaravij.pdf
    • https://cdn.shopify.com/s/files/1/0445/8492/7396/files/cryptocurrency_the_future_of_money.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/saturated_calomel_electrode.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/gisupudapipiwuzetamivina.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/zosagiririmibokeka.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/tomexideweralusiniguguleb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/zamufok.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/tozixabugor.pdf
    • https://cdn.shopify.com/s/files/1/0437/6628/4446/files/roluketalajimarumiba.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005852.bin
28040e720ddd61cd4e6779f13525c8da6e261de27a59d096dce9211c80aca33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5852 5340 bytes
font_01_sfnt_off00006a91.bin
c14a0b5ad6f9a0b361b563037b8ef8fdb4b78b4c24ed1b38d367d2715e6c7f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A91 10076 bytes

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