Malicious PDF — malware analysis report

Static analysis result for SHA-256 1303a0fdccc70bb9…

MALICIOUS

PDF

55.2 KB Created: 2020-08-23 09:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 165cb5fa71e812736f74c00a337d1bb9 SHA-1: 293d745b5cd7f4a6268fbdf765c39937ccad7997 SHA-256: 1303a0fdccc70bb9946e0d084c184af60807719ccc17afe3fbdd270d5e884921
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'sheet music' and embedded URLs, which are likely used to direct the user to 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.cc/pify?keyword=creedence+clearwater+revival+drum+sheet+music
    • http://vamejado.lvapparel.net/uploads/1/3/1/4/131436977/bivibofavovam_pudamaguti_dijoros_mixopibilar.pdf
    • http://files.dkgalphalambda.com/uploads/1/3/2/6/132695438/ruwurovedukope.pdf
    • http://files.mywrappingco.com/uploads/1/3/2/6/132681342/zerisizivugidinat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/62825291719.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/21712942053.pdf
    • https://cdn.shopify.com/s/files/1/0437/3600/6810/files/59242095844.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/foluxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/solid_converter_full.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/nokojagok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0173/2520/files/envision_math_grade_3_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/sap_basis_administration_practical_guide.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/cvc_words_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.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_off00008864.bin
8064432a1e51539a7535a21064ff6050c4dcb0e6d327b8cde5bdd4daaf0d3387
pdf-font-stream PDF embedded font (sfnt) at offset 0x8864 5236 bytes
font_01_sfnt_off00009a13.bin
4fffe70d09954fa1732e8d69ba29724a4527fa3a9d964a6571f092503479bb89
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A13 17392 bytes