Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca17b1904b2da8c…

MALICIOUS

PDF

49.1 KB Created: 2020-07-31 07:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42b4769b4c217c2a19be7b2121dcb20e SHA-1: ce921039d74602c9430c3c0551f30f85f7c64351 SHA-256: 0ca17b1904b2da8c2ee69ea86a0a3c5764a1d2ebb5b99e2fe37db0604155052b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is the redirection via embedded links.

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=magisterium+5+pdf+ita
    • http://files.activeinitiatives.com/uploads/1/3/2/6/132695569/740742.pdf
    • http://files.redpetalsmedspa.com/uploads/1/3/1/3/131398085/zevedabakumusawoj.pdf
    • http://files.unitedwayofpc.org/uploads/1/3/1/3/131379608/zamiketofatoxo_worironez.pdf
    • http://files.millvalleychickens.com/uploads/1/3/0/7/130739340/5180252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/rovulirosuvoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3336/files/2652276543.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/wolelopezowen.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/riwegulesejenavinumadediw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7165/9414/files/19815590122.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8831/files/kilujilosem.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/61916873573.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/61170209935.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4820/files/pafoguloz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8703/files/38532612786.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/44721932581.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_off00008461.bin
f1a1ba8b1648f5c560e0e6f0dce992341312d6cdce814a01fc67040ad668f1ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x8461 5124 bytes
font_01_sfnt_off000095d5.bin
2d661c67d8ccaf601fd2241282d4276a6e522730a51a0056573b8ab3f8b5f9df
pdf-font-stream PDF embedded font (sfnt) at offset 0x95D5 9816 bytes