Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d389ad5b1e247d3…

MALICIOUS

PDF

34.4 KB Created: 2020-09-01 20:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9e6f0525156c1f9ed7ae889a7dc7af83 SHA-1: e076c035639c3d74a7dd9b6214599d4e37b7570a SHA-256: 2d389ad5b1e247d37ecb8635220335a219de77df425bf819a81e1f296cd815fd
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to `https://ttraff.club/pify?keyword=factoring+polynomials+worksheet+grade+10`. This technique is often used to obscure the true destination and distribute malware or phishing pages. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=factoring+polynomials+worksheet+grade+10 In 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/1/0438/4745/0774/files/noun_verb_adjective_worksheets_4th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/67001174428.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/software_installation_guide_template.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/74e905_cd68eeb6ca184404b09112f540f4a3c6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/9119866653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/csa_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/29744428345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/9917790090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4996/5978/files/93027547353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/30305990120.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1862/3896/files/ruvaguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/raxolodizipapovif.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_off00004700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4700 5892 bytes
SHA-256: b8052afc79d01886451eee5b81ae8d57325d0ed7e4be58e95da5c385ebbe5b16
font_01_sfnt_off00005b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B06 9956 bytes
SHA-256: cdbbce626c7466454f38d067f4c9b7e5950410492deaf252416e2a408cf51d12

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