Malicious PDF — malware analysis report

Static analysis result for SHA-256 8104d59574f47fb1…

MALICIOUS

PDF

42.1 KB Created: 2020-08-24 22:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c501eabf9a4cc1424d7bafbf05f2fdcb SHA-1: 03290d69308cf7c28de0daed6e1ddf1a6cdf26f3 SHA-256: 8104d59574f47fb165bc38e4c9d84d314ca7f86c91f3d1438977fbdca6a9fe77
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'password manager android' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger network of linked documents, likely for SEO manipulation or to distribute malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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=best+app+password+manager+android
    • http://tutibavuk.umbrapoodles.com/uploads/1/3/2/6/132682883/liluxagezisunogag.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/20607618674.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/xagudopoxenavafotosaxixet.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/gewonud.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/14872516165.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/89943871915.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/4616288700.pdf
    • https://cdn.shopify.com/s/files/1/0435/9687/3885/files/23520220155.pdf
    • https://cdn.shopify.com/s/files/1/0435/9693/9427/files/danadaduvulazak.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/66529004567.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_off000066e7.bin
9428de7b00af9a9bea9efb46450b6ed9335c27519f0f15cd4483b831e16d807b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E7 5388 bytes
font_01_sfnt_off00007937.bin
5c44f4d8cde6bbc35811d400d7721bbb26e27ad7b165c3e243b5b62b2bfa7220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7937 10168 bytes

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