Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e8c764ff2b9d75…

MALICIOUS

PDF

59.1 KB Created: 2020-09-04 10:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68280cc1cefc0497538a36f6693bf19 SHA-1: 84c4d97e0cbd3c2df5f4c969019cac28e6b1ee2a SHA-256: e7e8c764ff2b9d759031c1593ef9587dd7f943a6b93491e3575ff3f5b2e34673
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. This suggests the primary purpose is to lure users to malicious sites. The presence of a link farm further supports this, aiming to increase visibility and traffic to the malicious infrastructure.

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.club/wix?keyword=antropologia+aplicada+foster+pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/adsense_arbitrage_hack.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/53892609973.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/50697840500.pdf
    • https://static.usrfiles.com/ugd/61804c_4a5e95ceb7114b5290f3083f38c1e835.pdf
    • https://static.usrfiles.com/ugd/12dc78_2fd77a3a23484850abd679e6f9c387cf.pdf
    • https://static.usrfiles.com/ugd/c345b0_61cd757977374f3f96298fdf3ad1ed0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7ab7b7970844811aeeabe7b5dd323dc.pdf
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/sekup.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/99597986142.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/89387736058.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0763/files/6258693279.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/gukifanajuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6433/6290/files/vemonamesuvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/negipojetokikokigofoxuki.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_off0000a9a5.bin
a431453414a6cb019c5de13547ec5a2d101ce88c269fd71c04a0f0c4966498a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A5 5312 bytes
font_01_sfnt_off0000bbc7.bin
9ebd445454f6859ed8be68729baef0a6367eacaafe43e43785868766f0a35ff3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 10376 bytes