Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ddaa3fdb95c6e5…

MALICIOUS

PDF

38.7 KB Created: 2020-08-31 05:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb4118480980032c9ce6fbcea9c6d027 SHA-1: 540b4f6de99294bb2e583c8b8f68b5cc900a4b00 SHA-256: 19ddaa3fdb95c6e52667b0c54a63a195d8f0ee1c11c96ed1cb8c689e75b05111
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one pointing to a known malicious redirector (ttraff.com). The document body and heuristics indicate a link farm strategy, likely to manipulate search engine results or direct users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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/wix?keyword=inorganic+chemistry+notes+pdf+for+ne
    • https://cdn.shopify.com/s/files/1/0433/5468/5599/files/aashto_lrfd_bridge_design_specifications_7th_edition_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/vosatam.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/sokekedatopolupamatavituj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/pekeseteworaxovuzaloguva.pdf
    • https://cdn.shopify.com/s/files/1/0448/4166/4669/files/pharmacology_of_anticoagulant_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/jodovesotavilib.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/san_francisco_police_department_online_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/27996726635.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4262/files/free_amharic_bible.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/nadule.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/devuvope.pdf
    • https://cdn.shopify.com/s/files/1/0434/3195/2536/files/kusojudubawuneg.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d12.bin
2d187c569b761698461143bf9f1d961cabf9deddd9b5ae69ec71af759905d3be
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D12 5364 bytes
font_01_sfnt_off00005f20.bin
8c432a9abb4b92748763ded335153a4332096a8891f93ac3c79ad4e9b6936147
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 9612 bytes
font_02_sfnt_off00008023.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x8023 4324 bytes