Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b999a1243fcd570…

MALICIOUS

PDF

40.4 KB Created: 2020-08-24 07:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c826c13a5ea908858e51e3d5dbdcf99e SHA-1: c828045da671c28e8ca93ee825bc1be3016d5b22 SHA-256: 3b999a1243fcd57005eb93c1f76cc965d45b1a07594adc3df7fc359724bda13d
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though partially corrupted, suggests a lure related to a 'leadership skills assessment template'. The presence of numerous external links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=leadership+skills+assessment+template
    • http://tofarenen.backwoodsdogboxes.com/uploads/1/3/2/3/132302944/871b0523a4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1905/0908/files/59122610751.pdf
    • https://cdn.shopify.com/s/files/1/0432/7551/8107/files/estimation_worksheets_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6477/files/affidavit_of_adverse_possession_texas.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/bogerewum.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/lisik.pdf
    • https://cdn.shopify.com/s/files/1/0429/7277/4556/files/sosanuzowivi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/levikefuwazeworipumavim.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/dna_hybridization_technique.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/39932189636.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/86589502032.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_off0000614d.bin
ed94490051c7b84bbae9272bd078958b0320e442948e2ecb98648af38a381904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614D 5204 bytes
font_01_sfnt_off000072d8.bin
0340c2f69224275f2fb391a068dddffc388d23a26776725efe52ff6571f7fed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D8 10084 bytes

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