Malicious PDF — malware analysis report

Static analysis result for SHA-256 175492cce994a3e0…

MALICIOUS

PDF

68.8 KB Created: 2020-07-31 09:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 457e307629cb4cc72646e8ba90ec8259 SHA-1: cd1d84e06bdff7274e903295ae6c242151d41be6 SHA-256: 175492cce994a3e0d6cd4fa10623e5ee27c36f24791fde751c52be1504a3a625
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector for 'angina symptoms pdf'. The document body, though heavily obfuscated, appears to be a lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=angina+symptoms+pdf
    • http://files.brookekellyband.com/uploads/1/3/1/4/131452733/bulilojefu.pdf
    • http://files.carlya2zmusic.com/uploads/1/3/2/6/132682883/kabuxaxado.pdf
    • http://files.cflhfes.com/uploads/1/3/1/4/131407469/kibaxutup-xonaxawa-xurez.pdf
    • http://files.mobile-mower-fix.co.uk/uploads/1/3/1/4/131453453/9077981.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/musavutuzisavopilifani.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/wesasitasefiranufizegag.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/pulasoxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/39004730149.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/52223078638.pdf
    • https://cdn.shopify.com/s/files/1/0433/5327/6574/files/30014500009.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/bedodatolaxaxomiguzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0357/files/37336961841.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/56122383060.pdf
    • https://cdn.shopify.com/s/files/1/0435/6125/5073/files/74978118345.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/jebarinedujowikewarari.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/tesan.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/monogekabixelejilenoga.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_off0000cf0a.bin
9f807b1b9c06ba4888cb0767120c352c3e8198c0611abb0717afb733737849fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 4992 bytes
font_01_sfnt_off0000dff6.bin
7fa63518d7e25bb95031bf323774a24833517bc83381f92bceac7d48ee7478be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 11104 bytes