Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc990086c0de7cec…

MALICIOUS

PDF

35.9 KB Created: 2020-10-06 13:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8348ecc29f8bb7cfbceeeb8ba8628232 SHA-1: 75cde42362e6055ad3c4f68ce45755cc4392487c SHA-256: fc990086c0de7cec603a8b7e8d6ade7da23957dae51d8d8baaf1afa5e6acdb97
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to redirect users to malicious sites, potentially for phishing or malware distribution.

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.link/pify?keyword=heart+of+the+oak In PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/moxaleluwofikojefajeliw.pdfIn PDF document text
    • https://site-1043126.mozfiles.com/files/1043126/60463914477.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/zowutekurefen.pdfIn PDF document text
    • https://site-1039645.mozfiles.com/files/1039645/mugumusuxiniga.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/96031210226.pdfIn PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/xozofigawosunekupesozadub.pdfIn PDF document text
    • http://files.elermorevaleshoppingcentre.com.au/uploads/1/3/0/7/130740231/105983a6dd.pdfIn PDF document text
    • http://files.8citiesnb.com/uploads/1/3/1/4/131406369/robopu_dubewidiwox_befolideror.pdfIn PDF document text
    • http://files.somersetcountyfarmersmarket.com/uploads/1/3/1/1/131164211/lonajijabi.pdfIn PDF document text
    • http://files.cathleenpalumbo.shop/uploads/1/3/2/6/132680853/kumevud.pdfIn PDF document text
    • http://files.theplaymakermanager.com/uploads/1/3/1/4/131438164/52c9d802b697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8289/0918/files/50258718587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1896/3109/files/electric_field_half_ring.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6144/3230/files/fanafogamad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1463/8749/files/download_ed_sheeran_thinking_out_loud_video_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/75014099167.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFC 4668 bytes
SHA-256: fbbaf3101dbe44db259b5e925dece6022af30f7e5792dbec665a8a76776cb3a9
font_01_sfnt_off00005fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD3 10340 bytes
SHA-256: 2a89dacdc45b9b2e22a502f48ed50e94f8c6a55de1cf0303333cbf1f4b5a133d

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