Malicious PDF — malware analysis report

Static analysis result for SHA-256 670891a16e9800e6…

MALICIOUS

PDF

121.0 KB Created: 2020-08-05 03:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 259f78defe0cbedcbbf44c467f5c5939 SHA-1: 034f182d4d94cf99f5afd43fffa327d916ac98aa SHA-256: 670891a16e9800e608b0b1ff38adf7d7c5493abe5ef21ef7f2441f62a9a5aa83
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, indicating a phishing or redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests the PDF is part of a larger link farm, likely for SEO manipulation or distributing malicious links. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

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=les+cerfs+volants+de+kaboul+pdf+gratuit
    • http://lijewi.nightowl-omnias.com/uploads/1/3/1/1/131163667/6fb1c1d156736.pdf
    • http://files.gotericreativearts.com/uploads/1/3/0/7/130776254/kikopoker_xutovade.pdf
    • http://fuzenemaw.faharwest.net/uploads/1/3/0/7/130740025/2722053.pdf
    • http://files.giulioplotino.com/uploads/1/3/0/7/130775221/846659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/32904717317.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/66570548515.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/vezutaropuvimolalewago.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/32534852897.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/82587466082.pdf
    • https://cdn.shopify.com/s/files/1/0439/8484/7006/files/list_of_forensic_files_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/67693843178.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/tevafetujewonavatunegom.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/sufelorosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/juvuwemedifok.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_off00019b45.bin
c9ee9c285d7dfcaa415782bfd045b27ebcac496247f586c51f4b88ab393d8aec
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B45 5528 bytes
font_01_sfnt_off0001ae2b.bin
7e0bd5ea49d89eb55ad51f7c95bdd60a08169677a5f2cbab62275b762fd1f194
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE2B 12664 bytes