Malicious PDF — malware analysis report

Static analysis result for SHA-256 28311ae27d8cb781…

MALICIOUS

PDF

47.0 KB Created: 2020-10-04 08:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c88e39463aa7e5aecfd94ac0755d2d2f SHA-1: 75abd0ceae1e8cdfa9f990df6c82c9f0617eaf5d SHA-256: 28311ae27d8cb781587d4ba62edb4863f4cc614014f7154dc57f66e3d39839a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to known malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a strong intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent.

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=khan+academy+sql+challenge+bobby%2527s+hobbies In PDF document text
    • http://wimirik.broydeblog.net/uploads/1/3/1/8/131856772/jajawonidetad.pdfIn PDF document text
    • http://files.klausiskoming.com/uploads/1/3/1/8/131871979/lopum-namiza-ritajimoxazitel-fubaborexol.pdfIn PDF document text
    • http://files.edenfarms.net/uploads/1/3/0/7/130739535/dezamipuzidipajatad.pdfIn PDF document text
    • http://linewi.stpeterstpeter.com/uploads/1/3/1/6/131607331/tawakumibovebo-lodupegavomeja.pdfIn PDF document text
    • http://files.pupplesapp.com/uploads/1/3/1/4/131452938/fafomavona_kelaxekubita.pdfIn PDF document text
    • http://files.dynastycap.com/uploads/1/3/0/7/130739240/dodisekedarupezole.pdfIn PDF document text
    • http://loreju.eichas.net/uploads/1/3/0/8/130813458/tekuvaduv-zekeliwajekibaj-ropojenerokosex-sutugupab.pdfIn PDF document text
    • http://wobogib.sunrise-pta.org/uploads/1/3/2/6/132695675/gibosuxa_foraputot.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/1/0432/3672/0798/files/vorilox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4777/9494/files/76514779222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4190/9653/files/ap_calculus_ab_-_worksheet_33.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1821/5846/files/mass_of_fe_in_grams.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5888/6806/files/82330461126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2955/7148/files/ffxiv_squadron_recruits_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4481/2438/files/tera_priest_guide_essential_mana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/probability_tree_diagram_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5739/4076/files/family_dollar_phones.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_off00007a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A65 5628 bytes
SHA-256: 13c7cc01d0281e634669359ce9c71411b69b4762d48c2e1558107d4091cd3382
font_01_sfnt_off00008d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D77 9644 bytes
SHA-256: d9e57b29f473372108b0fbb4bc73e862ae28fcd30d3739f5f8fb73ea3169ecaf

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