Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cdbbc3cb588d66…

MALICIOUS

PDF

43.9 KB Created: 2020-08-22 04:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04f1a517e063843527d9db1a94bd77f8 SHA-1: f402dca1be5f3d2c49059be5051265f2b7dcc019 SHA-256: 11cdbbc3cb588d668b2b9b383ea0c1caeb3519eeab160ca935a066fa7def76e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or spamming operation. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a redirector service, likely to obscure the final malicious destination.

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=writing+a+comprehensive+report+in+special+education
    • http://bubiz.magentawilde.com/uploads/1/3/1/4/131406390/605733325eb2afe.pdf
    • http://files.terrifictuakau.org/uploads/1/3/1/4/131409309/damapuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4423/1575/files/79056662733.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/storytelling_marketing.pdf
    • https://cdn.shopify.com/s/files/1/0432/1450/4093/files/precalculus_with_limits_4e.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/dupizujitijotelafajow.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/anatomy_of_bodybuilding.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/52156442544.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/jafopa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/27446675986.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/sazavuwixeletoful.pdf
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/pdf_to_word_converter_download_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/standard_form_into_vertex_form_converter.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cce.bin
edb480bd5ab2d878d905c385196c1d6f6cbeeebe60c8458ee1acc483a6e15076
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCE 5560 bytes
font_01_sfnt_off00007f90.bin
996451a11f4ff917e500782ff35de3973df6f2657f207a1322c3bbcd631b459a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F90 10144 bytes