Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f61d5304312a7c…

MALICIOUS

PDF

111.0 KB Created: 2020-08-21 13:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a60651c962c8c97c35c12791bf8f57b1 SHA-1: 1a0f71be25c7deed8c91203958206b60466018ae SHA-256: 15f61d5304312a7c9b7bc5e9e13427fa9e870ee7d76874e7c2e7165878b919fe
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is used to host a lure for 'lanternfish esl water cycle answers'. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external PDF links suggests a link farm intended to distribute malicious content. No scripts were extracted, but the primary malicious activity appears to be redirection via the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=lanternfish+esl+water+cycle+answers
    • http://files.bagnallproperties.com/uploads/1/3/0/7/130740571/9c7ec8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/13483407728.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/algebraic_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/the_butterfly_effect_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/74232984919.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/mewal.pdf
    • https://cdn.shopify.com/s/files/1/0428/5169/6796/files/96059328310.pdf
    • https://cdn.shopify.com/s/files/1/0431/0695/9514/files/spectrum_buyout_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/advanced_spatial_analysis_the_casa_book_of_gis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0439/1786/9211/files/52601268116.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016813.bin
bf6a79f31f60b85913d15d3edc39de9500450d9e0eac10a539157d833d568a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16813 3684 bytes
font_01_sfnt_off0001753f.bin
b7c200d9d22013fc3b94fc3009928330529f2a7ada15a85b0093324c3eebd702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1753F 5104 bytes
font_02_sfnt_off000186a6.bin
f1c2ad774570b10db0dad7dfb41cdc9fa0e3b67b6bcdb0e96ee1eb5d7fa17b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186A6 12556 bytes

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