Malicious PDF — malware analysis report

Static analysis result for SHA-256 742aeff2e9dce9bc…

MALICIOUS

PDF

46.5 KB Created: 2020-08-10 23:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcdafac104ee784cf7184af4bfeb9d3a SHA-1: d8332d01483dd8d648b9d2556c83a9cf75e73fb0 SHA-256: 742aeff2e9dce9bca0b96683503e6d490be2b0afde11136eee0928f1b94be84b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristic firing. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of many external links indicates a link farm or redirection attack.

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.ru/pify?keyword=agenesia+renal+fetal+pdf
    • http://xawetawi.creeksideinthecanyon.com/uploads/1/3/2/8/132814930/4400748.pdf
    • http://rovod.feastva.org/uploads/1/3/0/7/130739024/xapizinokejeji.pdf
    • http://files.oleanbarbershopchorus.org/uploads/1/3/0/7/130776175/tejifo.pdf
    • http://fizidako.derrickjackson.com/uploads/1/3/0/9/130969352/pekefexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/1021282056.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/45398505841.pdf
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/nidedixavibukirupopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/wavemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12035000993.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/kujuxani.pdf
    • https://cdn.shopify.com/s/files/1/0451/7065/5381/files/interview_questions_and_answers_for_science_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/92040576802.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/nomemovajagogavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/niroxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c29.bin
f80c9cd6bbeac0b22a7876e88fc96ee5e9e15f9d14728f4082c215dd4bdba7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C29 4876 bytes
font_01_sfnt_off00007cbe.bin
47a69b3f6bff78d0dfd4b5ad1bfe6f5fc9843b7e793984e0a986925743cdef3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBE 9976 bytes
font_02_sfnt_off00009ec2.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC2 4324 bytes

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