Malicious PDF — malware analysis report

Static analysis result for SHA-256 8523ca12055a00b2…

MALICIOUS

PDF

38.2 KB Created: 2020-09-13 09:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f91f8b1d6b00df4a8e22be442bb3fa65 SHA-1: 2baf0250f812eca9d8f40928ce215f52cf6367cf SHA-256: 8523ca12055a00b2807162504fbc7b205a4e29389e1b0576edef7967717d6b40
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, disguised as search results for educational material. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of the URL https://ttraff.club/wix?keyword=vocabulary+workshop+level+c+unit+8+test+answers strongly indicate a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence.

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.club/wix?keyword=vocabulary+workshop+level+c+unit+8+test+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/5e81b9_47e33a56f8c34b07abc64f2f0a2315f8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a141e5303cdf4d0892d752e5f9f955af.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9757e7_8ab3650ba5ae4543a98cf83c81199aaa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_be66833404b94fb0b528e06dfa17749b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ab63e3_f28ea72c37ac47a785610f0da09ee324.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_02fc83144f7545f687d0250a539dcb4b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2a1f5c131d9f4c5cbc50b2a8917f02dc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3aca14_822fd5abfbd349ecb41597662687c0d1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/astronomer_s_wife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6521/3089/files/tatelujevitavuzowudex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3506/9096/files/hackett_group_benchmarking_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/13846720081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7229/8646/files/sequences_worksheet_ks3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6960/2981/files/sifasivirerujel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/besame_mucho_violin_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/75584748438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/anatomy_for_sculpting.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A54 5520 bytes
SHA-256: da2ad31b84cfecb90678900083c812baaf6bbe35a70ba533417a549739f5345a
font_01_sfnt_off00005d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 9788 bytes
SHA-256: c5985505c07c95840816a18ee81c324b8efa0e8407dfb9b270c3eeb6178d8c07
font_02_sfnt_off00007da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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