Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e3b2aa8ee48e99…

MALICIOUS

PDF

38.7 KB Created: 2020-07-28 06:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f18b33dbc1067c8cb79bb6252b8664d7 SHA-1: 51a3735c6fb524e16af329a1e7ecb563cb57faa4 SHA-256: 54e3b2aa8ee48e992a443799fa50581437834fbcd9ae54ef2a8f44ca61b2970c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF document contains a lure related to jury summons, which is a common social engineering tactic. It embeds multiple links, with one critical heuristic identifying a link to known malicious redirector infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, appears to contain metadata related to jury summons and the wkhtmltopdf tool, suggesting it was generated programmatically to host these links. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm strategy to distribute malicious 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=guide+to+jury+summons+leaflet+uk
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdf
    • http://files.ngoji.com/uploads/1/3/0/7/130740257/3939674.pdf
    • http://files.moonhawkvisions.com/uploads/1/3/0/7/130739069/8106072.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0431/9880/8224/files/supitil.pdf
    • https://cdn.shopify.com/s/files/1/0437/8607/6309/files/43564268847.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9782/files/30274108313.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/wedogomodekaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/3481/1290/files/fekotamanekunozaximunomot.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/42980712254.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/datexerudizewavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xedatojif.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/bezufilixavurasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/wudirikenuzolevomexosuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/ravudixilifixud.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9150/files/senidawimeritizejevur.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_off00005a5e.bin
580ec45153970b8322afa19e360ff18eff394c41a38489b26f94f28c35e18a59
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 5208 bytes
font_01_sfnt_off00006c0a.bin
e8d0bf09b3f614a16c37bc827a13bdc1f975e4a1238551f8bdfefe53c8c25f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0A 9860 bytes