Malicious PDF — malware analysis report

Static analysis result for SHA-256 913452dfb8d22eef…

MALICIOUS

PDF

40.7 KB Created: 2020-11-05 09:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8b260344b1a451c7233348434b6f835f SHA-1: 1b5bf9ff4fd789be3db9714d158d6de255ff96d0 SHA-256: 913452dfb8d22eefc64694537e9b1b0ebb94ee3e622195e7671d6ccbd26b9f65
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.me/123?keyword=brain+candy+trivia+game', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a 'trivia game' lure. The presence of numerous external PDF links, including the malicious redirector, indicates a link farm or redirection tactic to distribute further malicious content. No scripts were extracted, but the PDF structure itself facilitates the 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.me/123?keyword=brain+candy+trivia+game In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5fa0a2afcc01b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fa1417cd79a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fa15f831e96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_5f94540fca9ee.pdfIn PDF document text
    • https://zobejonimofov.weebly.com/uploads/1/3/4/3/134354570/xobirafepiworak_duwelevu.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/8373909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/carbonate_sedimentary_rocks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71126e3-e884-4b98-9ca9-c8b16050d8e1/xiloja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a50cb1-37b8-4930-8f55-8d84419024fb/how_do_trees_uptake_oxygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7004342c-bde4-47c3-b955-2aadab8f5e71/jedojubetatudaror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe5af74-03e0-4601-88f2-8bc2aa99f2e2/fundamentals_of_human_neuropsychology_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecd1922-4203-46cc-be01-09a22e337237/free_download_rudrashtakam_rameshbhai_ojha.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/guan_yin_statue.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/24016143469.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_off000060c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C8 5260 bytes
SHA-256: 2d0cbd8bb9b380ec9b4180cccac1c8d06fa3600266a5aa6acd6af4839f7852e8
font_01_sfnt_off000072a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A5 10460 bytes
SHA-256: 3f953e7c6e7983de1c76de92b70dd057d164014a9d7a98ed02a2ad80d1db1ad0

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