Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f90e14972a1db50…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 15:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e2be6a37d3a1df3e5b7b83e023f1033 SHA-1: dc152d405cdd7accf7475fc923eec951bb27dfe8 SHA-256: 5f90e14972a1db50a7a124ae509a6b65697e21cf567420f04dade003e390a302
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes text suggesting it is study material, which is a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to 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.ru/pify?keyword=sap+bods+study+material+pdf
    • http://files.valeriaflorescano.net/uploads/1/3/2/3/132303310/ae6dfe.pdf
    • http://files.edenfarms.net/uploads/1/3/0/7/130739535/dezamipuzidipajatad.pdf
    • http://files.adventuresav.com/uploads/1/3/1/4/131408970/241a9da.pdf
    • http://files.sistersrobotics.com/uploads/1/3/2/8/132815206/faxobavudivuf.pdf
    • http://files.novafairytales.com/uploads/1/3/1/6/131637325/zesafunofabun_duzexedate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/dikurodukexiniguxapef.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/xokopezimosubevipemakixon.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/fazesobezilewixonabugane.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/38024204224.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/lumbar_back_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0454/4213/8262/files/introduction_to_calculus_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5560/files/61789854316.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/sapokajomawilevabasamip.pdf
    • https://cdn.shopify.com/s/files/1/0446/0252/3812/files/physical_science_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/ribifumusu.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_off00006360.bin
56f119bf2f03aa9940e4f77e304fb1e9b1b27115ad7922ca6e3755e6ca03d93c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6360 5532 bytes
font_01_sfnt_off0000760f.bin
2a94fd08bc017e055cefa64101c3b2bc7445765d73f161266e1877f82bef0428
pdf-font-stream PDF embedded font (sfnt) at offset 0x760F 9548 bytes