Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cd24b0b7370edd…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 05:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b0eabfb47551cec8ab8d7a472f07c2 SHA-1: 3dbfeab3b0ea82e7ba20a05aae4aa6671ca43ece SHA-256: 16cd24b0b7370edd17a41c7dff38f3ba3e475049ab1a720a6812e40af1f24228
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 external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One prominent URL, 'https://ttraff.com/pify?keyword=energia+e+meio+ambiente+livro+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that likely serve as lures.

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.com/pify?keyword=energia+e+meio+ambiente+livro+pdf
    • http://files.yeagleysdesigns.com/uploads/1/3/0/7/130738639/6410290.pdf
    • http://files.schonedanes.com/uploads/1/3/1/3/131383386/ropinokarexijuj-wonogurajokase.pdf
    • http://files.libertylodestar.org/uploads/1/3/0/7/130740571/xapafexulujitodut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/88099700739.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/bibuburatopituxejuned.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/vomibazi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/44924675589.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/fibopusimonak.pdf
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/98589829191.pdf
    • https://cdn.shopify.com/s/files/1/0437/6241/7825/files/81606923567.pdf
    • https://cdn.shopify.com/s/files/1/0431/5178/6135/files/8711378355.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/44748346195.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/gewixujuniveku.pdf
    • https://cdn.shopify.com/s/files/1/0429/4787/0876/files/99419425169.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/20158927599.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/john_deere_x_475.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/bukesamafo.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_off00005af5.bin
dc3674d42c1befa219464adc0c3e938ca84c5595d669b15a1616fc59321839f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF5 5340 bytes
font_01_sfnt_off00006d11.bin
4fde1f65560971706feb4a1bb5fd6478ddaf41b870f05379f3517bc4e248f245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D11 13056 bytes

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