Malicious PDF — malware analysis report

Static analysis result for SHA-256 560164a44f8d5007…

MALICIOUS

PDF

40.2 KB Created: 2020-08-15 01:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34d9a786c502a7b83f859cb9698ff60e SHA-1: 00ad57164092cfe8c4a9d99d4a2ec2ff4feff893 SHA-256: 560164a44f8d5007df43782ef428d316bfc6d12445ea9afd9202c48c5225b533
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as an ecology lab report. It also features a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the document body confirms the lure and the presence of the malicious URL.

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=ecology+lab+report+format
    • http://files.climbireland.com/uploads/1/3/1/4/131408798/sonetazizufu_siwonesip.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/71959100723.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zemivok.pdf
    • https://cdn.shopify.com/s/files/1/0432/9766/9278/files/vuvububa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6104/2591/files/get_apk_from_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/2718/3269/files/alternating_current_circuits_4th_edition_solution.pdf
    • https://cdn.shopify.com/s/files/1/0430/7212/7125/files/caballo_de_troya_5_libros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6525/3792/files/dusaxaziso.pdf
    • https://cdn.shopify.com/s/files/1/0434/8723/2166/files/barbara_ann_brennan_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/phonics_activities_for_older_students.pdf
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/college_panda_writing_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc4.bin
4fa21fd64facb37312d12fd61c941c637433bcdd3f0b57c2e09d56c65b61c5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC4 5356 bytes
font_01_sfnt_off000071ef.bin
ffa00f70157516fb15632af8205f24b8e2a6b2a5a5021fb22ce9b22c83efe8f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EF 10160 bytes

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