Malicious PDF — malware analysis report

Static analysis result for SHA-256 259897ce5445ef77…

MALICIOUS

PDF

33.2 KB Created: 2020-08-17 04:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc1ec333d1d91852f32db925ff1a8f03 SHA-1: 0afe389b20a24b90d6d0451c8c99be22e25c395e SHA-256: 259897ce5445ef778e3681c97343e52c422a1bf8b8eb138fa89df6546f9a2185
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious redirector URL, suggesting an attempt to lure users to external content, possibly for SEO manipulation or further exploitation.

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=solving+absolute+value+equations+practice+worksheet+answers
    • http://kizibuji.time4reading.org/uploads/1/3/2/7/132740228/linusavofesavafigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/narekupatarupifojalefobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/avik_sarkar_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/angiografia_periferica.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/cancer_gastrico_celulas_en_anillo_de_sello.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/google_chrome_high_cpu_usage.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/tisum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3415/5928/files/zabatad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/merinepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/40465816223.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/autodesk_aec_collection_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/grade_10_math_module_answer_key_unit_1.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_off00004292.bin
9d794931dd2e81eab188fd183526eddb71605c0e5b081b32c711f5427afb7ce2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4292 5780 bytes
font_01_sfnt_off0000564b.bin
a7c55bf1ae8d1303fb83d984954147bf3253b93cbd7036d6c32cf4738f7374f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x564B 9772 bytes