Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6ef8da993103e1…

MALICIOUS

PDF

45.4 KB Created: 2020-07-30 02:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4b6cc37e09a3f45f74cc4bd9b95561f SHA-1: 6071c996fab38c138ce1f96772649258570b7305 SHA-256: 0c6ef8da993103e1d059c14cc1fe99a12e3e6ea96a2c75b718df30e23a051ce4
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. Another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=libros+de+antroposofia+pdf
    • http://files.trinitywellnesskc.com/uploads/1/3/1/8/131871740/015ce.pdf
    • http://files.artistiquegym.com/uploads/1/3/0/7/130739449/siwimufof.pdf
    • http://files.heritageschoolofdiscovery.com/uploads/1/3/0/7/130775145/9742970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6811/0488/files/mafivuletofexopeta.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/73026488472.pdf
    • https://cdn.shopify.com/s/files/1/0439/9605/3662/files/18808767386.pdf
    • https://cdn.shopify.com/s/files/1/0435/3982/4799/files/momufowizoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/41244656702.pdf
    • https://cdn.shopify.com/s/files/1/0435/1826/3464/files/vogeso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/gusinuwizufupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/bevun.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/88920597102.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/kiwufe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/vigin.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_off00006fa7.bin
3494e1f6fdf5cd1fb788a3eec1485f8a65a2fee7ceaf23438bb32855e53ba090
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA7 4872 bytes
font_01_sfnt_off0000802f.bin
bd7c654939ab2149dd90c3c006d8fbf499e03e17f55b0bc33442de852f6ecab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x802F 11972 bytes