Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe5cf125144dca0…

MALICIOUS

PDF

34.7 KB Created: 2020-08-09 21:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e8df5fe2a0513099484c23804436bb8 SHA-1: e5534f1497ee408723060d16a76ff2c0c1072200 SHA-256: 3fe5cf125144dca087c4ef7c9cbe440ea0b6b10ffc7801b9dd3e908ac72851ed
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 of which point to domains associated with link farms and redirectors. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'material requirement planning case study pdf' and a URL that appears to be a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users through a chain of links, likely to a phishing page or a site that hosts malware.

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=material+requirement+planning+case+study+pdf
    • http://files.pinnerplayers.com/uploads/1/3/0/9/130969841/3100697.pdf
    • http://files.lukalahfarm.agency/uploads/1/3/1/6/131606630/0317872.pdf
    • http://files.themodernmomnetwork.ca/uploads/1/3/1/6/131636758/919c8cebc67812.pdf
    • http://files.ronamaybryan.com/uploads/1/3/1/6/131636941/jotudosuvipose_gozumaxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0024/7958/files/vasinen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/kufozujedukesebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/68621010832.pdf
    • https://cdn.shopify.com/s/files/1/0428/5402/3327/files/50453472019.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/51607025189.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/gs_convert_to_png.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8072/files/47102191122.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/biomes_of_southern_africa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9414/6200/files/rabamubeluropuma.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/17369418725.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2341/files/pekajexaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/rakonefoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/77560391782.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_off000049aa.bin
c21c5da4df2f5cb36437d1f5f4750d0df78badb8906211734cc128266202657f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49AA 5708 bytes
font_01_sfnt_off00005d08.bin
43254c8cdb3cd5a4c75420a76f520f5b470cda6569585856dc1e02cb9eff1378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 9500 bytes

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