Malicious PDF — malware analysis report

Static analysis result for SHA-256 79443bba0d200ea8…

MALICIOUS

PDF

39.6 KB Created: 2020-08-13 04:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03f4b7a3e38e1a3423debb6a9d078a0a SHA-1: 9bb28608c9571ae619b9b8cf038fe6c4ce66d5e2 SHA-256: 79443bba0d200ea8a118f2754fe6b582b1f781a52918ee288f41c735fb9a7709
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Csrf 1 form pdf'. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, further supporting a malicious intent to drive traffic to potentially harmful sites.

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=csrf%201%20form%20pdf
    • http://files.susanblackmonauthor.com/uploads/1/3/0/7/130740477/9cdf0451066921.pdf
    • http://files.goodstuffbyshalonne.com/uploads/1/3/1/8/131871586/wozifovuvepu-xojatitodobag.pdf
    • http://files.stanfordamends.com/uploads/1/3/2/6/132681517/venusexezap.pdf
    • http://fosafufib.ahlatemple.org/uploads/1/3/2/8/132814930/6503605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6013/3030/files/24993197718.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/risulemupifizabab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7790/2234/files/45254199640.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/10368174068.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/40179869085.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/dojebisuraf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/42191725344.pdf
    • https://cdn.shopify.com/s/files/1/0440/5349/5958/files/achyutashtakam_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/dawn_on_a_distant_shore.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/biology_practical_handbook_11th.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/31969401148.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/jalalanokokalivapu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/vidojezedifanukaxik.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_off00005f19.bin
37c26f4ea1dfc9ac86051288a2165d8eb4e6ea4a47f5370a0dbc768ac8d5c6c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 4904 bytes
font_01_sfnt_off00006fb7.bin
8bce9d85e3fcd2e368b97123dea1d2c9437c595760b54c974e3f34959f587f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB7 9888 bytes

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