Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a74235d6fda0c0…

MALICIOUS

PDF

37.9 KB Created: 2020-08-15 09:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a63b9fc8d9daf358f2f38319b721b7a9 SHA-1: dee9336a3b2a3fb708bdbf9c26256dc5673f53bb SHA-256: 61a74235d6fda0c00f86222704061eee6df5f88978bd9ca19c96fd2631ff458d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'Lexus nx 2017 owners manual' and includes the malicious URL. The PDF was flagged by a critical heuristic for linking to malicious redirector infrastructure and for being part of a link farm, indicating a likely phishing or malware distribution attempt.

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.cc/wb?keyword=lexus%20nx%202017%20owners%20manual
    • http://sejoxe.polos.org/uploads/1/3/0/7/130775639/pojexadug_xixaxiwi_juluda_zeridurezulu.pdf
    • http://juror.tiffanythetherapist.ca/uploads/1/3/0/7/130739751/bamavawetolepudinude.pdf
    • http://files.sfmwgc.org/uploads/1/3/1/3/131382590/5177bd20836e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/fotirobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/66841592289.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/jomupobuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/vemodixunaso.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/nilugavinadimoge.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/mesivodaja.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/wapazexix.pdf
    • https://cdn.shopify.com/s/files/1/0438/0426/2561/files/52013904486.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/vujozekisotatawigabib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7423/files/wonijuvopevupiganomufej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/batixipadufijunilojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6389/files/nikola_tesla_mes_inventions.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_off000049bf.bin
0ee6929e3dfb57cf65eaf0bc98c09b867d43179ea36298014b26dc3bea5f54be
pdf-font-stream PDF embedded font (sfnt) at offset 0x49BF 5336 bytes
font_01_sfnt_off00005bf1.bin
9a9e698c6073474b9e2ad1f777247832da8e5c77a83a5f7510a94d33e48c1c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF1 14272 bytes