Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7a06a2c4769b54…

MALICIOUS

PDF

43.9 KB Created: 2020-08-04 18:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad39eb61a273150ab644b67087bbd7fb SHA-1: 751ec0993634bb0ddca78f5dea8f79892b5532ec SHA-256: 6a7a06a2c4769b54f0a94949d345d7509ec11f929e47b1d83d70b0dcc9888207
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 a redirector URL known to host malicious content. The document body, though heavily obfuscated, also contains the redirector URL, suggesting an attempt to lure the user to a malicious site. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=cadena+de+valor+pdf+porter
    • http://files.fcampagnari.com/uploads/1/3/1/6/131636654/gisidixobujur.pdf
    • http://files.lincolnfencecontractors.com/uploads/1/3/2/6/132681938/7c5f525598fb.pdf
    • http://files.cindyhuntermorgan.com/uploads/1/3/1/4/131406606/1764b6c.pdf
    • http://files.spice-grind.com/uploads/1/3/1/4/131453354/sisiluxedifoboxuget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/98739304951.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/38717869137.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/gerunigug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2982/files/piduwukobovawikupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6624/files/30768312033.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/23338317885.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/63850478064.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/75494247985.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/29333524029.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/25167557009.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_off00006b67.bin
86097af4a3c1c2223b5503b34391b39c07d0794e286c4670f52f5082d1c9e034
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B67 4824 bytes
font_01_sfnt_off00007be3.bin
82bf6f84520f1ba0690661106b742b77651cc20ed22fe3bd688147c1af40d495
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE3 11616 bytes