Malicious PDF — malware analysis report

Static analysis result for SHA-256 525f04f3497617e7…

MALICIOUS

PDF

41.9 KB Created: 2020-08-30 16:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f213001d059a6abec72b80fe6a07b55b SHA-1: 17e0f63e8b0b3bc64b323af91601c883f5f8150e SHA-256: 525f04f3497617e707a42fe80697798ebcb8b1ada6e4a5bd7730f54188017e21
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a free music download. This is further supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the malicious URL, suggesting a social engineering lure to drive traffic to the redirector.

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/wix?keyword=beyonce+mp3+song+free+music+download
    • https://cdn.shopify.com/s/files/1/0428/2069/8268/files/atharva_veda_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0435/6207/4261/files/51560164243.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/tafuriluso.pdf
    • https://cdn.shopify.com/s/files/1/0436/1394/6018/files/81827261513.pdf
    • https://cdn.shopify.com/s/files/1/0435/0764/6630/files/in_vein_rick_ross.pdf
    • https://cdn.shopify.com/s/files/1/0443/2723/9836/files/braveheart_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/83948422032.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ecca8e6416e440db3b65cac44bffcda.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_e099398ae1144de896c7f1e9f90dcd87.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1945de8c2834e48916708e4aeb9e4e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3e7be759fe04d28b8091b7f5141e79f.pdf
    • https://static.usrfiles.com/ugd/ab059d_a534394d63cc4f73acf3f4fb050ed8a8.pdf
    • https://static.usrfiles.com/ugd/a4e402_a0ec214594c04ef29bacc6e2275dfaa0.pdf
    • https://static.usrfiles.com/ugd/b8c837_47e7a86fa69c4d9eb9c52e1113801517.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_off00006461.bin
e357b726ea8d8dab43f088348cfaa9c14c90d70b0161e91eac17f4a935a1f932
pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 5880 bytes
font_01_sfnt_off00007860.bin
28f2ffb4422095e2bb1b333131433a4c3157dcee3ef2e5c6f72559e5a491463b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7860 10172 bytes