Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ba852485ab8fce…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 08:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1519abb6a8b0575d068840bcd9f780f4 SHA-1: 58d986c90509a26449e418ac330aea524290c759 SHA-256: 24ba852485ab8fcef72016375e26bbe5fa0947ab9a267f90139940ea4c3db493
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes a URL that appears to be part of a SEO link farm strategy, aiming to drive traffic to potentially malicious sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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=how+to+manual+in+tony+hawk+skate+jam
    • https://static.usrfiles.com/ugd/353d00_ea3608926d7946b08dc5c8b43d28c75f.pdf
    • https://static.usrfiles.com/ugd/b8c837_99d81550f2d043c0ae25a9aa20ca5d12.pdf
    • https://static.usrfiles.com/ugd/b8c837_19f89640d3bb44aea2a338c217176e68.pdf
    • https://cdn.shopify.com/s/files/1/0435/1046/4667/files/wokajixogixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7466/files/97006934754.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8627/files/vuboxoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/rimokofepobukoregukena.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0163/files/auditoria_fiscal_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4966/files/open_appendectomy_steps.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/nofunexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/questar_rebates_2017.pdf
    • https://cdn.shopify.com/s/files/1/0463/6891/5617/files/varedibozavisini.pdf
    • https://cdn.shopify.com/s/files/1/0433/6336/9125/files/administracion_de_la_calidad_total_libro.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf4ec05f5bf402faf6d38e30f2777ea.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_788c613a973d4ac3ac292811cdfbfdce.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_off00006551.bin
ca442dfe54403cd0b8f501fa7e0e6a757c28c1d3f86fd8ee8517a792cd305dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6551 5124 bytes
font_01_sfnt_off000076a6.bin
0917f065512c4ebe2a7ddbda21ec09b21c6cbc94d5d659c18944d4ec5b49a426
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A6 10692 bytes