Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8760a86d41f8677…

MALICIOUS

PDF

38.9 KB Created: 2020-08-15 11:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a9fe90cfceaab6ae34a3047410aa518 SHA-1: 1194968bcf3596c5cc62f5e72012d1d7cb8405f9 SHA-256: e8760a86d41f867703aa5ee90d2bf0a12f2db19fb48a3074255e73415eed7431
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure for a 'Samsung tv manual model number lookup'. The PDF_SEO_LINK_FARM heuristic indicates a large number of generated links, likely for SEO manipulation to increase visibility. The ML_NYX_PDF_MALICIOUS heuristic further supports 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/wb?keyword=samsung%20tv%20manual%20model%20number%20lookup
    • http://delagibo.nrgphotography.com/uploads/1/3/0/7/130776445/31fc465f1c5.pdf
    • http://files.lexarosean.com/uploads/1/3/0/8/130814254/megilun.pdf
    • http://files.headfordgirlsns.com/uploads/1/3/1/4/131437566/rorokusasidex.pdf
    • http://files.hrsdtc.org/uploads/1/3/1/4/131453463/fc904b.pdf
    • https://cdn.shopify.com/s/files/1/0455/4752/0165/files/nabosumexepepazisufudibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/84663288.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/46615813209.pdf
    • https://cdn.shopify.com/s/files/1/0433/1595/3817/files/18572207313.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/94754187885.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/15808134398.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/23875728198.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/jitekasubotob.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7090/files/49255767895.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/gevizixepirexafi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ee.bin
742bdb2b777751202e56fcbc676fd92f0ac653b3d09baaf70247679d7000de96
pdf-font-stream PDF embedded font (sfnt) at offset 0x58EE 5644 bytes
font_01_sfnt_off00006bff.bin
2127b07de7e4b52256e9a6a1f4be8f5b9f264c6dd2f18e688b013b73d1284a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFF 10248 bytes