Malicious PDF — malware analysis report

Static analysis result for SHA-256 e765f86a9d3563db…

MALICIOUS

PDF

111.1 KB Created: 2020-08-26 06:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f995ddb06cd857173df29f18cf802860 SHA-1: a3d142dd5c9e74f82cd571e67987bb62344b00de SHA-256: e765f86a9d3563db652568e74080eaff068853087e7f89671c940d2eb127a37e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to Shopify-hosted PDFs. One of these links, 'https://ttraff.cc/pify?keyword=fengsel+innsatte+s%25C3%25B8k+broward+county', is identified as a malicious redirector. This suggests the document is part of a link farm designed to distribute malicious content or phish users.

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=fengsel+innsatte+s%25C3%25B8k+broward+county
    • http://files.acrha.org/uploads/1/3/1/3/131381067/1396725.pdf
    • http://files.coletteelenastyle.com/uploads/1/3/1/3/131381288/kutinewebasimomoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/indore_master_plan_map_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/algebra_2_textbook_mcdougal.pdf
    • https://cdn.shopify.com/s/files/1/0436/9317/9030/files/nsw_traffic_accident_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/8841/9741/files/86882301460.pdf
    • https://cdn.shopify.com/s/files/1/0457/3698/4742/files/guided_sleep_meditation_chakra_tuning.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/66635517092.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4807/files/wanib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1939/5491/files/afatds_training_manual.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_off00016e19.bin
9b1c0907980753fc3a6754f186d2edbc8d55f72dafab3d735efd5a8989d59567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E19 5600 bytes
font_01_sfnt_off00018150.bin
2001f79daf43943bf74b7feb11a6975875aad689aa20d82821d4f7840102c823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18150 13748 bytes

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