Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ed376d6a0fa9d6…

MALICIOUS

PDF

39.3 KB Created: 2020-08-15 02:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70ab56d5aed5c13bdff6332cfae1c545 SHA-1: d12bada1dbf1530d276739fe4fd40d855f1833e6 SHA-256: 83ed376d6a0fa9d68b2d62f64fc3f32a226ba2b7b3d4848c554294d7d2be79f5
154 Risk Score

Malware Insights

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

The PDF document contains a link farm and a primary malicious redirector URL, indicating a phishing or scam attempt. The embedded content, though obfuscated, includes the malicious URL and references to downloading files, suggesting it's designed to lead users to harmful content. The ML classifier strongly flagged this PDF as malicious.

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=aplikasi+bobol+wifi+id+di+android
    • http://zazura.winsberg.net/uploads/1/3/1/6/131636612/8d7c6f138.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5572/7260/files/60568702375.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/1050381357.pdf
    • https://cdn.shopify.com/s/files/1/0430/7632/1434/files/windows_10_registry_tweaks.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/cfit_skala_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/lofebek.pdf
    • https://cdn.shopify.com/s/files/1/0435/3156/7256/files/wavaminixuja.pdf
    • https://cdn.shopify.com/s/files/1/0441/0825/1288/files/op_sword_command_1._14.pdf
    • https://cdn.shopify.com/s/files/1/0429/9984/0921/files/miwinixuzixozosuvukige.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/digestive_system_diseases_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/forward_contract_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3959/files/4364844178.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_off00005b14.bin
a71e2b63894d18107d67c48bd4090eb06f200d0d875112e1cfd791015dacbcb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B14 5320 bytes
font_01_sfnt_off00006d39.bin
217d84cf99383cf8ccc16261e31981e8c88f055d6d82d3a0a6d3335b10d7906d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D39 10360 bytes