Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d61efdbb453f2a…

MALICIOUS

PDF

34.0 KB Created: 2020-08-24 23:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b661c707077d992c669c055bab6fdc SHA-1: 5ffc4cb2382b0594d2f2e39799c88233f2153466 SHA-256: 35d61efdbb453f2ac30660a619f18d35d17fc227cae5912a8099370a250e966e
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=sembulingam+physiology+pdf'. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and contains what appears to be a reconstructed URL, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=sembulingam+physiology+pdf
    • http://wivigasa.emptagephotos.com/uploads/1/3/1/4/131437246/vefexanaweza-watubir-jozuke-saboruruwexinef.pdf
    • http://files.ajukmapparel4.com/uploads/1/3/1/6/131637529/nogepup.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/vento_scooter_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/fezoxenamavux.pdf
    • https://cdn.shopify.com/s/files/1/0461/7194/7161/files/buddha_hoga_tera_baap_movie_moviescounter.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/75329171132.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/cantaloupe_island_trumpet_solo_transcription.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/domain_value_estimator.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/13720434089.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2791/files/kentucky_dental_jurisprudence_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/4825/6156/files/77259525791.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_off000047bf.bin
5784eef24cbe11e60397d2cfa31d3f351431bf98364120217d70bb02aa02f964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47BF 5704 bytes
font_01_sfnt_off00005afb.bin
dce65e89bc0e3ba90a40871dbf8418b5f5712c7b8092b22eedd91a100bb4fa4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFB 9620 bytes

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