Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10d63a7f9421e05…

MALICIOUS

PDF

44.0 KB Created: 2020-08-29 16:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f0ebfbac2af881e431e1463e29b89d SHA-1: 9750fee4e353f0e06475825f8e58d740cada8de7 SHA-256: b10d63a7f9421e05a2d325ea49c7aaf11a8595eeecd477ce9e98aec632005966
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of URLs, including a known malicious redirector at 'https://ttraff.cc/wix?keyword=itext+html+to+pdf+header+footer'. The document body and embedded links suggest a lure related to document generation tools, likely to redirect users to malicious content or facilitate further infection. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=itext+html+to+pdf+header+footer
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/kemafipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3548/3551/files/99321170827.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/topogoxelodituminetabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/zijuwonuvawupis.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/14792893157.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://static.usrfiles.com/ugd/11f207_c8ff259d173648ea8f7dcaaf4d37ead5.pdf
    • https://static.usrfiles.com/ugd/b8c837_98a3294d0fdd43828a85bcd1b00c5cf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3243ba198d514fe3aa9ffd07cfddc361.pdf
    • https://static.usrfiles.com/ugd/b8c837_df1a1c20865c4c6e9d4104b2398e5560.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/chemistry_notes_class_11th.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/nitesuxijunajafin.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_off00006626.bin
23c252a7480dc7ca1bd2c1237427f455a7b009286f4caccfb7cd32c60f404ab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 5108 bytes
font_01_sfnt_off00007761.bin
7943f865692508a2d6fedc848df4bf636433b4368861966c05849d608db244a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 13632 bytes