Malicious PDF — malware analysis report

Static analysis result for SHA-256 84645d8d51d651c4…

MALICIOUS

PDF

46.1 KB Created: 2020-08-22 23:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71a118ad3bf41286a381054c2b0daf09 SHA-1: e8ff06325eada0a3adeafab38a74cf64b2ff4411 SHA-256: 84645d8d51d651c4b72c82630e1285ad4f513e2c13606960edb5807a8646f576
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the same URL, suggesting a lure to external malicious content. The ML classifier also strongly indicated maliciousness.

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=ms+excel+compare+data+in+two+sheets
    • http://binewewi.steelin1.com/uploads/1/3/0/8/130874218/medaxaruvozugu_zefuzidixoje.pdf
    • http://files.michelepowles.com/uploads/1/3/2/7/132712661/16bed5e2a3ee0fd.pdf
    • http://files.redyogaannarbor.com/uploads/1/3/0/8/130873851/8594409.pdf
    • http://bimaxip.patiencereformed.com/uploads/1/3/1/3/131379698/64df974.pdf
    • http://zudaged.lafayettetheatre.org/uploads/1/3/1/4/131483281/c0782a142b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0453/5307/4843/files/autobiography_poem.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/gasozadugazira.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9773/files/parasitologia_humana_neves_13_edio_download.pdf
    • https://cdn.shopify.com/s/files/1/0464/6567/9512/files/baahubali_the_beginning_telugu_trailer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0348/6103/files/introduction_to_geographic_information_systems_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1163/6381/files/xopelogumozukuxuxijodus.pdf
    • https://cdn.shopify.com/s/files/1/0435/8412/7135/files/64016615406.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/momuvipedubelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/24177116726.pdf
    • https://cdn.shopify.com/s/files/1/0435/8461/8653/files/kundalini_yoga_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/80989098939.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/apnealink_report_results.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_off00007605.bin
5df63ddc5c0824bde7d4893f955b28b1322177c2dd70becdaf00c46742a930f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7605 5476 bytes
font_01_sfnt_off00008890.bin
9e02cc732571edc889e46c03bf7cf225c664d190dd1a782039f5b38f599615f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8890 10004 bytes

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