Malicious PDF — malware analysis report

Static analysis result for SHA-256 793a672de7597379…

MALICIOUS

PDF

38.5 KB Created: 2020-08-17 00:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f3dafb0f9320983d0d7e3ea0e90e0c9 SHA-1: 0e01f6bb07955237985ac3ecc7fce8c62a199886 SHA-256: 793a672de75973791e1c42b544878b5a3e84c7c9b3754844058e70878604f893
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 external resources, including a known malicious redirector. The document body, though partially obfuscated, contains text suggesting it is a worksheet, which is likely a lure. The presence of numerous links and the critical heuristic firing for a malicious redirector indicate a high likelihood of this document being used to distribute malware or conduct phishing attacks.

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=lewis+dot+structure+worksheet+with+answer+key
    • http://gigufipif.vapors-4-u.com/uploads/1/3/1/6/131606457/mobekadipad_lodotevep_gawenepozage_zabuzaxu.pdf
    • http://vukalagom.childrensbridgefoundation.com/uploads/1/3/0/8/130814011/dukilaxefu_ritiduk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/20487695121.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/nuzumufosexiwasus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/debalarokakitoparaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/21725687944.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/jevoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/42605988810.pdf
    • https://cdn.shopify.com/s/files/1/0438/6239/2992/files/3_circle_venn_diagram_template_with_lines.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/61934105213.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/34758283836.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/palamekug.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_off000056b7.bin
f85d22475b15ff03a2da3f34c62ccf761f35ae7c0f99ae4e4f7ed48b12cc03d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B7 5192 bytes
font_01_sfnt_off00006874.bin
92927d3a2ea131e450505870440a23b0eb4b425a69111b46d70b41d2f9f5e695
pdf-font-stream PDF embedded font (sfnt) at offset 0x6874 10276 bytes