Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de44f8ffd176912…

MALICIOUS

PDF

54.6 KB Created: 2020-08-02 13:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33988aa4dfef659ab0ab10648e18b79a SHA-1: 5a6fd15db2be52ea1020e96e79989142c89b9ca4 SHA-256: 6de44f8ffd1769124b5f4bbe3a228986b2bab0465c7ab937cdd3cd1c4cba673b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.ru/pify?keyword=arduino+pulse+width+modulation', is designed to lead users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO manipulation tactic.

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=arduino+pulse+width+modulation
    • http://files.decartsohio.org/uploads/1/3/0/9/130969188/ravogo.pdf
    • http://files.iamfokis.com/uploads/1/3/1/4/131483053/wosesimulipekamufuda.pdf
    • http://files.ggevents.us/uploads/1/3/1/4/131454255/90358.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8637/9163/files/list_docker_containers.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/raxokadetavuzalotutozin.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/army_apft_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/danuvirenavogorasepovune.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/bifijil.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/fubekeremosuvinalafab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/44452345412.pdf
    • https://cdn.shopify.com/s/files/1/0428/7198/0198/files/tumekigowaxerurudol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2076/2783/files/79450982634.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/cobra_200_gtl_dx.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4684/files/pewukufezamopuboputivot.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/57928596761.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_off0000981a.bin
9d0b9fa4327b7052542c179ab104bd3e05f4da3969c7bd14eb4e843520f6f265
pdf-font-stream PDF embedded font (sfnt) at offset 0x981A 5280 bytes
font_01_sfnt_off0000a9f1.bin
22206ac70e63e4f55929fa0811989ba8e880f7bc4c2dfdfbeff72336540b6fbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F1 10304 bytes