Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f3b9161e5441e4…

MALICIOUS

PDF

48.2 KB Created: 2020-08-31 04:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0412daaad750ed797028f49a045fdd6 SHA-1: 0a32682dbc41dc41543f6381f70767a6e8c504c5 SHA-256: 39f3b9161e5441e473579d8eed9a32154c63e3879213d7f65d0dfb72420ec97e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Ins T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=patch+fsx+windows+10'. The document body and embedded links suggest a lure to download potentially malicious files, masquerading as software updates or legitimate documents. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=patch+fsx+windows+10
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/3ds_max_sofa_models_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1356/files/34648357312.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/23743607896.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/broncho_vaxom_bula.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5078/files/wiwisenos.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/59637371930.pdf
    • https://cdn.shopify.com/s/files/1/0434/9417/8982/files/melufixisabizudodojesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/12989626584.pdf
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/vopej.pdf
    • https://cdn.shopify.com/s/files/1/0437/3925/0853/files/44833877522.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/39383558959.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/pangngalang_pantangi_worksheet_for_grade_5.pdf
    • https://static.usrfiles.com/ugd/26938b_cc61fe91a74840a5a70de0835fb41e0b.pdf
    • https://static.usrfiles.com/ugd/bfbc46_9e1eebe60cae4ff188118fd38b837f69.pdf
    • https://static.usrfiles.com/ugd/b85eb0_c8c66dd506c745d0a9b38d9dde763749.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006afa.bin
1860d17fe23bf1fcb96b259d3c4804dd6c6719e8caa74bfb9d3610ec75c74b73
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFA 5004 bytes
font_01_sfnt_off00007c05.bin
5ea7f5f4f967071ddb48388ca7f9277eeb4e4203b9c51bcb759e62028439e0df
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C05 13220 bytes
font_02_sfnt_off0000a606.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA606 4324 bytes