Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a7c197f2e766e1…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 10:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9878d6d63c64022a438b76c92054df4 SHA-1: 9f74be91df1aa12ba540b728efe6a7ee598f6dae SHA-256: 17a7c197f2e766e175fd7a7034c309e0d538221bf45da952277d7a84231f9f68
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious link identified is https://ttraff.com/wix?keyword=momento+de+una+fuerza+ejercicios+res, which is flagged as a known malicious redirector. The document body itself is heavily obfuscated and appears to be generated content, likely intended to mask the malicious links and present a facade of legitimacy. The presence of numerous links suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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=momento+de+una+fuerza+ejercicios+res
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9c0842_89d03fc751244132bc490d7527256828.pdf
    • https://static.usrfiles.com/ugd/f46427_ae49ed1583774ac3a2e8d3d22f6448f9.pdf
    • https://static.usrfiles.com/ugd/e2c250_403221bf822843b6b89a205e17f35758.pdf
    • https://cdn.shopify.com/s/files/1/0443/4313/2316/files/ancient_history_notes_for_ssc_cgl.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/77083425945.pdf
    • https://cdn.shopify.com/s/files/1/0449/5713/9103/files/quenching_and_tempering_of_steel.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/zojikijaje.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3709/files/hansika_suga_novels.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/lezinatadevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2852/8799/files/acog_pap_guidelines_ascus.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/export_website_to_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/vopagibotatolimuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/lenovo_11e_chromebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/27721646427.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_off00006130.bin
9a28c8ffca68d972ee87a64792640eaf34fa6d8e1a96246afc3df66bf576efa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6130 5264 bytes
font_01_sfnt_off00007316.bin
88864a9ad2458f8487e8fc6a4759d9cc5b04cfab9ebca48b035a772db1bf2e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 11284 bytes

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