Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adedf227de8e9f7…

MALICIOUS

PDF

41.8 KB Created: 2020-09-30 16:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34b3e6f7bd85a4fc1e5413959b8756ad SHA-1: 289bb038afb6233c43ffee6b20c64b860f0a0e5a SHA-256: 1adedf227de8e9f7ef3fbe5b8e3e13914c0bea48e5d76cf17034e996b65b8045
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The document body, though partially corrupted, contains text related to teaching English learners and includes the malicious redirector URL, suggesting a lure to a malicious site. The presence of numerous external PDF links points towards SEO manipulation or a link farm tactic.

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://cctraff.ru/strik?keyword=challenges+in+teaching+english+language+learners+in+the+classroom+pdf In PDF document text
    • http://wawoze.michiganrealtysolutions.com/uploads/1/3/1/8/131856331/1938115.pdfIn PDF document text
    • http://xotoguk.sedonanomalies.com/uploads/1/3/2/6/132681443/safofozijirij.pdfIn PDF document text
    • http://files.bananatreeroots.com/uploads/1/3/0/8/130873781/gefapubele.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/1/0438/7795/7800/files/maplestory_3rd_job_level.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/del_sol_academy_yearbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7239/6193/files/mahatma_gandhi_biodata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/chromophore_and_auxochrome_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3019/7910/files/physiology_book_for_mbbs_1st_year.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/bdo_warrior_succession_vs_awakening.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7615/7607/files/automotive_a_c_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9893/0341/files/92055919286.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_off0000645e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 5476 bytes
SHA-256: 719a8d8d2488bba02cc29a9ebf2771fd5fac2b25adc559ea09a9e926e0448d0e
font_01_sfnt_off000076cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CD 10300 bytes
SHA-256: 933003870ffad1176c9452b7d2e3a41c6910871f7e7559242d03371bcd21d880

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