Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76b80cee6a6ac87…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 23:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bd83a3c33f6966a395b25aa8760dfd7 SHA-1: 0fa6a65bbb72e7a77ccc505bd2e4b7077687d3c3 SHA-256: c76b80cee6a6ac87fe3aa1e652d136fe884491835ac7a1b733d3e1b0305434ef
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded external links, a technique often used to create SEO link farms for malicious purposes. One of the primary links, 'https://ttraff.com/pify?keyword=project+introduction+presentation+template', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded links point towards a delivery mechanism for further malicious activity.

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=project+introduction+presentation+template
    • http://xofadu.etudist.com/uploads/1/3/2/6/132680813/zoborom.pdf
    • http://mazinin.scenealongtheway.com/uploads/1/3/1/4/131409090/e147a7545d.pdf
    • http://files.blissstudiovail.net/uploads/1/3/1/1/131164546/adc24.pdf
    • https://cdn.shopify.com/s/files/1/0441/3833/2312/files/lajijuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/10654875864.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/vekupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/90033192511.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/22491291517.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/40059924761.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/bambara_groundnut_journal.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/bescherelle_dicte_cm1.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/como_converter_de_para_autocad.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_off00006561.bin
8f83bb4d09cb8c33483c5f2c909136e3e7fdb844c15558ee119128ebaec5de73
pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 5296 bytes
font_01_sfnt_off00007748.bin
3c5fcafaf74333684b62055a1a04b03e0ab52b5106ca4cd23edcb6942a5d9901
pdf-font-stream PDF embedded font (sfnt) at offset 0x7748 9824 bytes