Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a683abe609bc53…

MALICIOUS

PDF

52.2 KB Created: 2020-08-10 14:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e2a60963cd4070b937fcb20e46277b2 SHA-1: a2f2c9e497d3e32799f133f043477c8b189c44ea SHA-256: f4a683abe609bc536b03f2905636b5c43c7a7ea28748282f395e3929bfb47111
152 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.cc, disguised as a resource for students. The document body and embedded URLs suggest a link farm strategy, likely to obscure the final malicious destination. The ML classifier also 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.cc/pify?keyword=automobile+engineering+projects+for+final+year+students+pdf
    • http://files.robintidwell.com/uploads/1/3/1/4/131407067/3030790.pdf
    • http://files.sydniedphotos.com/uploads/1/3/1/1/131163969/kitanufosuwejux.pdf
    • http://gufeka.fablegroundscoffee.com/uploads/1/3/1/8/131856907/poduvufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/l_allaitement_maternelle.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/53113539710.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/bigemunowafutotisif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/division_bus_stop_method_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1846/7997/files/dukumujusuwepikadodegiva.pdf
    • https://cdn.shopify.com/s/files/1/0432/5802/0004/files/54951640450.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3111/files/jeropurorewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/mufasogulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/29128415543.pdf
    • https://cdn.shopify.com/s/files/1/0436/8944/3483/files/lilikoxol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8596/3169/files/tijijejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/39833419144.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0469/files/42065861878.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082b0.bin
b78462f9d67e6281e494288d28e71b97a8c2817c3963d8acb672afcd78e1f0fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B0 2012 bytes
font_01_sfnt_off00008c42.bin
91d232c61a32941b852afd1a1ac8284a411c6d3bd8019b29b65de91af0d43f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C42 5780 bytes
font_02_sfnt_off00009fe2.bin
d9665021a6451423a064118f9a7ed4ef425ba3b99192eb43443476d6e9b786ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE2 10376 bytes