Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e0a0bb728d8665…

MALICIOUS

PDF

51.5 KB Created: 2020-08-10 19:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f67469f3cc8668a03ee3159ea2c45dc SHA-1: 5eae542ab413ea2b12b29490c68ecdcb45f5f822 SHA-256: 04e0a0bb728d86651622646c27c91f8cb318dad3893e68b0d8f60de9f6d9ec78
162 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to a map, suggesting a lure to encourage clicks. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=los+angeles+freeway+map+pdf
    • http://files.jtdudrow.com/uploads/1/3/1/3/131398224/pitunikunir_zenamux_jifisuxotele.pdf
    • http://zigigefen.afsheed.com/uploads/1/3/1/8/131856190/pijokove.pdf
    • http://files.sweetteasweettreats.com/uploads/1/3/1/4/131408245/3283174.pdf
    • http://files.soumyaarts.com/uploads/1/3/0/8/130814877/tusivuvul_xolupaga_laximonomola_vifonu.pdf
    • http://files.isadorazhao.com/uploads/1/3/1/1/131163777/xefeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/silowadawuvosel.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/45976502972.pdf
    • https://cdn.shopify.com/s/files/1/0430/8579/1383/files/pabedofakivudesutime.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/59917029843.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/jugusomupejowulebedela.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/kafosov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/27895695726.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/0939/9192/files/chanakya_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/wupiwedivirib.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_off00008b54.bin
715d4c2ae140d6913cf345a83484fcfe6fcdffd3d84c5888524e2b4733a9a405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B54 5496 bytes
font_01_sfnt_off00009e05.bin
f05cea3009bef2dfd0e3dbed36132b2b124b44c9b5c58fbbf7836595cd3285db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E05 10420 bytes

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