Malicious PDF — malware analysis report

Static analysis result for SHA-256 808561521a977b1c…

MALICIOUS

PDF

52.8 KB Created: 2020-08-23 23:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7be1e1483ff0ef503e176b0a6db57992 SHA-1: e3ccf45974eb32fa2d5ef31e93dac0c1fcbee83b SHA-256: 808561521a977b1cd8e80fa976fb03102c7b729efd53e3aaa36d068369e4cc7e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body text, though obfuscated, contains keywords that appear to be used as lures. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to external, potentially harmful websites.

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/pify?keyword=assamese+bihu+songs+junbai+2008
    • http://rivatim.mhsbritish.com/uploads/1/3/1/1/131164100/63bf52.pdf
    • http://xikinu.ciedualk.com/uploads/1/3/0/8/130874063/5263479.pdf
    • http://files.monsterboylives.com/uploads/1/3/1/3/131398250/3702545.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/93884861817.pdf
    • https://cdn.shopify.com/s/files/1/0440/5982/0182/files/faithful_texture_pack_1._8_9.pdf
    • https://cdn.shopify.com/s/files/1/0461/6437/7752/files/35327411629.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/birumimemofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/sosivoromiril.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/nisemerikifato.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/tebeketozoda.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_off0000817a.bin
295ecde76ca5e3ab713419d216ad105669b72dbfbfe5bf2b32446d9c482a1694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x817A 5644 bytes
font_01_sfnt_off00009488.bin
a2b2b47494085a08dbbae03d7ee798c23c5439b74f86d13d6e3a3b4cdeb99feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9488 15812 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.