Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be219c94668454d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-06 21:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1670761d0b0f0545f914e038c5da3f3c SHA-1: 151b73624d93959ec0f06530b69e5c9822906ce7 SHA-256: 6be219c94668454dfa8c64cc5b980a288043c61ae56b2f4901a2870dee121946
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but also includes the malicious URL, suggesting an attempt to lure users to external content.

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.cc/pify?keyword=george+bohlander+pdf
    • http://files.upcyclemom.net/uploads/1/3/1/6/131637190/2625430.pdf
    • http://files.sierrasteeltrading.com/uploads/1/3/0/9/130969465/1462035.pdf
    • http://files.starletjacobs.com/uploads/1/3/0/9/130969825/zagifimi-wukusowul-demidiz-siribetekofizon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/pevibad.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/mutip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/29938557414.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/10309630507.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/before_i_fall_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/pia_ananas_comosus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/regeroferiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/35844358264.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/walit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/22092040411.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a8.bin
eb1f4b68e11201c6d0f4e61c0acbbf3d786d93933bdeb11d76fa00bdd35a241d
pdf-font-stream PDF embedded font (sfnt) at offset 0x58A8 4956 bytes
font_01_sfnt_off00006974.bin
fe0988bde26f572558e3e152ca9e056385895d98a4d09e723b886b00494a7f6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6974 10332 bytes
font_02_sfnt_off00008c81.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C81 4324 bytes