Malicious PDF — malware analysis report

Static analysis result for SHA-256 59266bed801b17c8…

MALICIOUS

PDF

43.3 KB Created: 2020-07-29 14:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3929b30e63a0395a92db273936c38ae8 SHA-1: aefa88cd405f7db0030473a8fbff0826d5167dc1 SHA-256: 59266bed801b17c8c3cda60dcee5b89d72d7e6251866bd8e38e9ce2abec3769d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to domains associated with SEO link farms and redirectors. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.ru, indicating a redirection to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to art history, likely to trick users into clicking the embedded 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.ru/pify?keyword=minoan+and+mycenaean+art+pdf
    • http://files.sarahconstable.com/uploads/1/3/1/3/131383318/xowaxarogo_vuvusil_nununoparote.pdf
    • http://files.shanemarshallphotos.com/uploads/1/3/1/8/131871778/3749821.pdf
    • http://files.goldkeel.com/uploads/1/3/1/4/131436956/d3d932a1490d7c.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/posuxaxateziw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/17925341806.pdf
    • https://cdn.shopify.com/s/files/1/0429/3492/7513/files/33755353547.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/68134098727.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/95911785653.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/fujoxamame.pdf
    • https://cdn.shopify.com/s/files/1/0435/4647/6708/files/zurata.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/roxubuxodomirosataza.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/97393965258.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_off00006e01.bin
9110a43a278833744e77efc9245be63847c2f8fc111fbde761325f49519f63bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E01 4988 bytes
font_01_sfnt_off00007ee2.bin
2e801971ab810e63778fb881615d9ba580ba5d0f99f73aec7d692b68892c0217
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE2 9888 bytes