Malicious PDF — malware analysis report

Static analysis result for SHA-256 7499a5ec29415f8e…

MALICIOUS

PDF

39.2 KB Created: 2020-08-20 16:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb04c16f5d1da5fa3d5897e59730f763 SHA-1: d90e141a02161e92682646a7ec33fcc951533ec9 SHA-256: 7499a5ec29415f8e50c4a895be26ab004cd986d6c295fd5f6a7b503a96f8348a
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.com/pify?keyword=cie+a+level+physics+notes+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous other links, many pointing to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=cie+a+level+physics+notes+pdf
    • http://files.tntcenter.com/uploads/1/3/1/4/131407704/dobusoxoranevorevono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/javascript_full_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/you_raise_me_up_instrumental_violin.pdf
    • https://cdn.shopify.com/s/files/1/0439/8628/8798/files/biblia_de_estudio_mundo_hispano_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/9126/1595/files/winter_colouring_sheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0428/7060/3932/files/62099473200.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/tutuapp_apk_ios_free_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/viweva.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0133/files/archeage_unchained_mage_build_guide.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_off00005c15.bin
f8fab25723f03d1dc325cab40cd5199a0a37858b73ec61234adcd232c33c5a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C15 5212 bytes
font_01_sfnt_off00006dd8.bin
38b4f97b35998fe57dc420fab0c7db5b7b6b654e9cda0378d325ca22501c4311
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD8 10028 bytes