Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc3f9ab8a63dce6…

MALICIOUS

PDF

41.6 KB Created: 2020-08-17 04:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4b5f3b2a4c7915fd21687d5ef022b02 SHA-1: 06fbea53671bc70fc97fae627cd72cb746adfb66 SHA-256: 7fc3f9ab8a63dce65b87557037b4a26f12b1383a63e91ad314671a729a85f28e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body text and embedded links suggest a lure related to 'Thyroid guidelines 2016', but the actual content is obfuscated. The PDF also exhibits characteristics of a link farm, with numerous links pointing to external PDFs, some of which are hosted on Shopify. The ML classifier strongly indicated maliciousness.

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=thyroid+guidelines+2016
    • http://files.villinlannen.com/uploads/1/3/1/3/131398094/mizunijadinow_naxezuj_rasosezomuw.pdf
    • http://jemexed.onceuponacanvasbenicia.com/uploads/1/3/2/7/132741555/narajujazefulubaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/dark_souls_2_item_ids.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/35718844477.pdf
    • https://cdn.shopify.com/s/files/1/0432/4563/3691/files/adobe_acrobat_editor_free_download_software.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/22909925337.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/1675326456.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/16456591565.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/cracking_the_coding_interview_reddit.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_off000064b6.bin
f51d4afbe95b67addd52a0406bbca85db2b67931c2e3de2151dc0ba4f719cf17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B6 5408 bytes
font_01_sfnt_off00007729.bin
9a30e5afe70f05424282cc29ab928442b57a87f352e69213158011eb34597abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7729 10236 bytes

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