Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd12b5861ed721f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-18 17:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 301015d9c0bb02dbcf9cf91b5b993a39 SHA-1: ed142b915bccea1c68a3cd865b1443adaeaa5cd3 SHA-256: acd12b5861ed721fad3d6a53945773eb5fb20f155dd20bd77a7a945467f254b7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=month+day+year+format+java'. Another critical heuristic identified a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but also includes the malicious redirector URL and several Shopify URLs, reinforcing the link farm observation.

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=month+day+year+format+java
    • http://jiwidi.ggsafetyconsulting.com/uploads/1/3/0/9/130969744/7869725.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/zakiwazesozetovununoduwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/pukawuxumuzitowizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/fernando_pessoa_poems.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/wamomisutozaxefelaxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4704/9621/files/byrsonima_crassifolia.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/discord_text_size.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5079/files/81336979505.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/58017339293.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevola.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/surah_al_baqarah_english_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/6088208762.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/american_funds_forms.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_off00005d92.bin
425b57e1960650d17af7ac5a62edea8f78313141cb10ac1ed435cd226875fc18
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 5180 bytes
font_01_sfnt_off00006f24.bin
8bc3e4517fbd09ff3b67b095b772e788f7a2241561b2e67f513c00796f5425ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F24 9856 bytes