Malicious PDF — malware analysis report

Static analysis result for SHA-256 f402b7c88e721159…

MALICIOUS

PDF

41.9 KB Created: 2020-08-30 16:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5598431ca2b6c9048c35d79ac684235 SHA-1: 79bd1829dd7897f0fc84ee81454c917938829662 SHA-256: f402b7c88e7211596827d7c1e0cfc954fdaf12a44101f0c30ae4817c1f86f7da
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The primary malicious URL is https://ttraff.cc/wix?keyword=j+cole+kod+album+download, which is likely used to direct users to a harmful destination. The document body contains obfuscated text and references to the malicious URL and benign-looking Shopify links.

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/wix?keyword=j+cole+kod+album+download
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/2209499886.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/38045941458.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/kuvaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/nokenozomokufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/59196656595.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/92682478039.pdf
    • https://cdn.shopify.com/s/files/1/0428/6896/5532/files/10682863587.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/amd_a70m_chipset_driver.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/mcgraw_hill_7th_grade_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/dyce_primary_school_inspection_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0050/files/buxafamuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/97208265595.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/milabido.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/purble_place_cake_games.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/velefijumer.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_off0000665e.bin
4de268e7aa91284a4e7ac976b35ad853dc17d9f9151df5364286b1bd332935ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x665E 5096 bytes
font_01_sfnt_off000077b2.bin
c0d54efb81e8a597f760870d0ab2ca103c706fa2a8c6341a5c1ef6512f16ab16
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 10384 bytes