Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0acf718f3dba04b…

MALICIOUS

PDF

42.3 KB Created: 2020-08-23 06:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9183d0e359338eee07f70fdc89f2d3b SHA-1: d6c21a7a2e0c90680349cc1e3b8c5aac1a4bc781 SHA-256: a0acf718f3dba04b7bfb54d9889226a8d69244d3064bf866ee2478214912c75a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). This indicates a link farm or SEO poisoning technique designed to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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=broil+king+signet+90+manual
    • http://files.alekstinapoodles.com/uploads/1/3/0/9/130969818/gaxiguzategegek_tekotepakiw_livetijebure_natufumu.pdf
    • http://files.cthsurgery.com/uploads/1/3/1/3/131379828/nojumevolibe_runogazopuxex.pdf
    • http://denupob.davidstraange.com/uploads/1/3/2/7/132740930/3978507.pdf
    • http://files.chloescheel.com/uploads/1/3/0/8/130813042/5d7fab6f.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/binary_to_decimal_converter_with_solution.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/tupowidokoji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/bhagavad_gita_jashi_ahe_tashi_in_marathi_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/bizhub_c558_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/ketobakutifirogiwufozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/17985915318.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/abdominal_cavity_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/ignou_ma_public_administration_disaster_management.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/93858229941.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/guideship_in_bharathiar_university.pdf
    • https://cdn.shopify.com/s/files/1/0428/5726/7359/files/xikaruse.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/tonufireb.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_off000065ea.bin
edf6b7063db4c1b00f8b9b0d30739fa3fe0e9e0da78b0dfc1045e52a3bfc04c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EA 5416 bytes
font_01_sfnt_off0000783c.bin
67a9704e3097ac10480e088b0e25668fd2aa8df8d7548cf080edf53a3e9b5b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783C 10600 bytes

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