Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffdff6c10d05b7e…

MALICIOUS

PDF

39.7 KB Created: 2020-08-23 01:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f19226f38b083b1eed0a5918b28d985 SHA-1: 80257a8e1bcfa12ca6965511134c1b9e64a6b61e SHA-256: 5ffdff6c10d05b7e3c874fa7d9054a66a429f58fa309434391cd440eadcfcf58
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for redirector links. The document body contains a URL that points to a known malicious redirector, which likely serves as a lure to distribute further payloads or conduct phishing. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the embedded links are sufficient evidence of malicious intent.

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=character+traits+synonyms+pdf
    • http://files.romyservando.com/uploads/1/3/1/4/131453208/walefukuvapurorida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/4882623254.pdf
    • https://cdn.shopify.com/s/files/1/0434/4564/9574/files/30604475117.pdf
    • https://cdn.shopify.com/s/files/1/0435/6918/4931/files/anatomia_del_pancreas_endocrino.pdf
    • https://cdn.shopify.com/s/files/1/0432/5199/0691/files/hacking_guide_kali_linux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/90333476265.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/19948253180.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/articles_worksheet_for_class_2_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/autocad_underlay_slow.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/69854717047.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_off00005ebf.bin
d91bd446eb66a601ed5544a247cfea39b2ad5b785c78284a95974e271cd853fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBF 5368 bytes
font_01_sfnt_off000070da.bin
10e818476cfc0d136e762b397062505e895c451e247fedf4855298b250f80651
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 9996 bytes