Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f6cc7104ff76ee…

MALICIOUS

PDF

37.9 KB Created: 2020-08-30 12:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f304b8348580b7d3e28b04243e5c00d0 SHA-1: 2e9797089f8724717acf7b31cf01cdcf33bab0e7 SHA-256: a3f6cc7104ff76ee4275afe6c68be07f7430f955cec1d4f655733371be521a88
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with the primary URL pointing to a known malicious redirector. The heuristic firings indicate a PDF link farm and a malicious redirector, suggesting the document's purpose is to lure users to malicious sites. The ML classifier strongly supports the malicious nature of the PDF. No scripts were extracted, and the document body is largely unreadable binary data.

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/wix?keyword=tres+veces+tu+pelicula+completa+espa
    • https://static.usrfiles.com/ugd/269bb8_e10540834831454a929aafc2a824f23c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c33b2911070047f5bcef2f751b8f7695.pdf
    • https://static.usrfiles.com/ugd/5926b4_fc1dfd923aed46219b6f5a7e7ee55e22.pdf
    • https://static.usrfiles.com/ugd/3aca14_1182a93de98f4c799078c4054d3ee4cc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6117/files/36433510956.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/english_to_korean_alphabet_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/79881953830.pdf
    • https://cdn.shopify.com/s/files/1/0432/6283/6891/files/lezisibojudabab.pdf
    • https://cdn.shopify.com/s/files/1/0427/9857/9879/files/3571451763.pdf
    • https://cdn.shopify.com/s/files/1/0445/2093/1487/files/medical_anthropology_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/crystal_reports_version_13_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/55334550024.pdf
    • https://cdn.shopify.com/s/files/1/0428/6549/2127/files/bsc_magazine_free_download_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/south_african_tax_invoice_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3447/files/35887707418.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3764/files/90140439342.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/19627456784.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_off00005334.bin
73c71d9eaa2be1068d468cc7d427206dc32f7edaf46a2ce86f3df23c9cfd8c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5334 5088 bytes
font_01_sfnt_off0000646d.bin
b7ae6256003da64eca180673ddf71c0c19117b702146e7a41866986d905f2f98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646D 11216 bytes

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