Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf1cdd1691c1ff0…

MALICIOUS

PDF

50.6 KB Created: 2020-08-28 15:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4aa4d391cf8a653aba1742336352f03 SHA-1: 03a31780712e8e98fc0c8c81b8a3bc78f4a8edf8 SHA-256: 0cf1cdd1691c1ff043e45ba1bbd305565f0de0fef4f0e272d8eebd7589957ed2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=bts+wings+mp3'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external PDF links, many of which are hosted on Shopify but point to potentially malicious content. 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=bts+wings+mp3
    • http://files.jlongkandb.co.uk/uploads/1/3/1/6/131606368/da1337258866eff.pdf
    • http://kamevom.nickburbey.com/uploads/1/3/0/7/130739786/d13ac589.pdf
    • http://bakunufof.hislove4us.com/uploads/1/3/1/4/131408027/rurizudofobiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/kidijigevekanogeluvude.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/66357441331.pdf
    • https://cdn.shopify.com/s/files/1/0430/8870/7738/files/delhi_bye_laws_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/novartis_annual_report_2005.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1461/files/anemia_segun_oms.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/40563781878.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/balukavijenizezeboras.pdf
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/86373505689.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/culture_and_psychology_6th_edition_p.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/sequencias_logicas_raciocinio_logico.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nepel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/sesumuzimadazexaxup.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/98179920471.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060da.bin
cac63dc4c02a5447ee44c96eb69806624bade0b640de2f74dec90e07611c553c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DA 7280 bytes
font_01_sfnt_off000079a3.bin
4d572b44b8a92cc574ac1898d4546b895e2bdf89edb407b319795bab5edf3e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A3 4668 bytes
font_02_sfnt_off0000897a.bin
77252fbf967db10f8c79c1b398a7de9a7c6de3190af9cb41f7457f14a276bbd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 11044 bytes
font_03_sfnt_off0000af4e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4E 4324 bytes

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