Malicious PDF — malware analysis report

Static analysis result for SHA-256 829de134057fa64a…

MALICIOUS

PDF

33.2 KB Created: 2020-08-07 06:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccc8a31ff659a53cbb7076f6459dc44a SHA-1: c869010deea91e5630a8c990547d1a36c7eed490 SHA-256: 829de134057fa64a39be3bfa35c270a920797f15be2514864a5415d425dcfde3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the link farm heuristic suggest an attempt to lure users to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=bistronomy+french+food+unbound+pdf
    • http://files.dewsburymassagetherapy.com/uploads/1/3/2/6/132681772/2380285.pdf
    • http://files.alicebeecherpoetry.org/uploads/1/3/1/3/131383754/kedojumimalas.pdf
    • http://files.motherworkscville.com/uploads/1/3/2/7/132741109/ririb_gokomado_rutudapejejifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/61144107222.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/18127818018.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/27411687233.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/wedding_dress_sewing_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0428/6952/2599/files/pdf_bestand_comprimeren_windows.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/jozorifedeki.pdf
    • https://cdn.shopify.com/s/files/1/0438/4273/2192/files/42332730526.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/wafubaxanabejos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/fiber_optic_communications_palais_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/dilefo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/35429146875.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_off000045bb.bin
3e8fda217a4552496979de16071fb913550644638c13df16979c942966dc5a69
pdf-font-stream PDF embedded font (sfnt) at offset 0x45BB 5444 bytes
font_01_sfnt_off00005822.bin
8ed43d3c6c7832b93ee4e7a8fd7871c8b00cd18e5db1ffb3abe50bead99a655f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5822 9308 bytes