Malicious PDF — malware analysis report

Static analysis result for SHA-256 7413ff70a40d3340…

MALICIOUS

PDF

41.7 KB Created: 2020-08-10 06:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e8d74cd2711aecd68f05d9f2652e2c SHA-1: 2b780990d3abcfa30f4477f900f85dabc31805b8 SHA-256: 7413ff70a40d33409fc19e45828715a7055ea10c30fb6f2ba10e250f408c9308
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as the initial stage for delivering a payload. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=civic+education+pdf', suggesting a lure related to civic education to entice clicks.

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=civic+education+pdf
    • http://files.terefenckoturkeycalls.com/uploads/1/3/1/4/131455832/717665.pdf
    • http://files.hfttreefarm.com/uploads/1/3/1/4/131452997/luwuzaxasasetobup.pdf
    • http://files.karandefallon.com/uploads/1/3/2/6/132682235/lowotozenuzova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0435/7000/4126/files/wesajazaxux.pdf
    • https://cdn.shopify.com/s/files/1/0437/4796/7130/files/74922856757.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/36167668414.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/adding_png_file_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/81268403139.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3555/files/non_polarized_capacitor_values.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/navamemaburo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/54215982641.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21096031872.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/nudidofujigijifa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0259/2410/files/mijunawetalezitabaxuziz.pdf
    • https://cdn.shopify.com/s/files/1/0436/6771/8309/files/temanulesiwufeta.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/rotation_90_degrees_counterclockwise.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ea.bin
1d759f72a2866d36322237db20630ab7e5fdecf214942c1f9bc30f4b6c2be0c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EA 4808 bytes
font_01_sfnt_off00007766.bin
98fb0ad8a923bf71e3e680268fcd60beb92ea74b727ff5b504f021bbb8f046c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7766 9988 bytes

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