Malicious PDF — malware analysis report

Static analysis result for SHA-256 01da036fb4c745b0…

MALICIOUS

PDF

40.4 KB Created: 2020-08-14 21:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4861d67f52c46e842fc20e674a0c482e SHA-1: 658730abd998b254acbca5f67c0504aa7bccb0cb SHA-256: 01da036fb4c745b00b1b8fe433c9fd0b2eb1287b11ee21ee503d582b091bb418
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites via these embedded links, potentially for phishing or malware delivery.

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=shakespeare+sonnet+116+pdf
    • http://bufopo.goodmourningllc.com/uploads/1/3/0/9/130969060/34d8666e4b92.pdf
    • http://files.chordof3strands.com/uploads/1/3/1/8/131856352/wixixonupemup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/8887851875.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/8297694647.pdf
    • https://cdn.shopify.com/s/files/1/0440/8459/2805/files/60867016514.pdf
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/kufataxizizavid.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/34429508807.pdf
    • https://cdn.shopify.com/s/files/1/0433/7913/0531/files/66242323787.pdf
    • https://cdn.shopify.com/s/files/1/0435/2838/8772/files/15739391498.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4541/files/sowipopabivejukilemep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/30636608359.pdf
    • https://cdn.shopify.com/s/files/1/0436/0463/9907/files/sesulafokebad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/31728031639.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/toyota_avensis_verso_2020_instrukcja_obsugi.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_off0000602a.bin
cbcb6676a6a174c33dd5f5daf9c2107792a635c2b93f4412a7d72ec15315e4c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x602A 5472 bytes
font_01_sfnt_off000072b9.bin
2b76a159e15b85325bf0e7c710871a5dd79a735edbf9bc11cbb86bac549f5d42
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B9 10120 bytes