Malicious PDF — malware analysis report

Static analysis result for SHA-256 081e10ddbfd08a84…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 20:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36090eb959abe5781a69d38a2e5a21a SHA-1: 3e76eb0da2d1eb339c39d2d71c2a7fa06fa45dde SHA-256: 081e10ddbfd08a84bae813ed79f9fb0780618d8301b39691b4ebb3e3ad8e00b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, contains the same URL and references a 'link farm' heuristic, indicating a likely attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=answering+machine+meaning+in+spanish
    • http://files.medicarespecialist.com/uploads/1/3/1/8/131872286/pajapef_wofaxedofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/bloqueo_av.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/87074462124.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/15482251994.pdf
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/milixezepego.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39086675177.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/median_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/lidawiravakabor.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/24884056326.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/11479868189.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_off00005976.bin
954950d534eed3764119796c28e9b01f525e3919883d3990ba8bfa6d800443fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5976 5396 bytes
font_01_sfnt_off00006bb1.bin
98b922c9929250d02f26367110a21c2028d917d6d22e299fb72aba87da2727bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB1 11396 bytes

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