Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d848783d99c5df1…

MALICIOUS

PDF

44.9 KB Created: 2020-07-29 22:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5adcef523dddc5f0098d4dc4148dc3b SHA-1: bede12938df2610211ec095b61a89915a8ad6719 SHA-256: 4d848783d99c5df14feb619ad0e69f08fc164e1005ebc22aafe36f8d5194792e
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), while another flagged a large number of external PDF links hosted on Shopify. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a precise user-facing lure.

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=look+back+in+anger+kitchen+sink+drama+pdf
    • http://files.gethincoolbaugh.com/uploads/1/3/0/8/130814189/dcc6333c.pdf
    • http://files.focusedphysio.co.nz/uploads/1/3/0/7/130739621/bunawuxisug.pdf
    • http://files.samastawellness.net/uploads/1/3/2/8/132815767/7100101.pdf
    • http://files.laffertyanimalclinic.com/uploads/1/3/1/3/131382346/ketefuvufusarejizo.pdf
    • http://files.samastawellness.net/uploads/1/3/2/8/132
    • https://cdn.shopify.com/s/files/1/0428/3822/9158/files/xisojefokabuwaparajes.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/duxatulozujebobasisamef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/dawubekixovuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/xotumox.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/kewugigumepis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5833/files/mezapizivoduvipenanog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/75659890650.pdf
    • https://cdn.shopify.com/s/files/1/0433/5822/4549/files/wowofaxufupevu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3885/1751/files/fukobumivoge.pdf
    • https://cdn.shopify.com/s/files/1/0440/8783/6837/files/vazabezapuk.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_off0000718c.bin
1599feaa7bae426bcbf666509152638526b7cbeda066c9b295bb83eb19676e8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x718C 5472 bytes
font_01_sfnt_off000083f4.bin
83818c36d8eec4bcee3583eb0eaaf822d78948d7ae201513b0bfd3059e8ef56f
pdf-font-stream PDF embedded font (sfnt) at offset 0x83F4 10152 bytes