Malicious PDF — malware analysis report

Static analysis result for SHA-256 231cca13bf54657b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-03 15:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39f7b24db3fce06f95305d63fe6652a SHA-1: 0119c75c2ad8730f0230bc80efa318a75a8da1d6 SHA-256: 231cca13bf54657b8e82b46499015eba9ca8d283f9129f9f43c0c2971c1ed8c3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'modern business process automation' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm heuristic further indicates a malicious intent to distribute links.

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.ru/pify?keyword=modern+business+process+automation+pdf
    • http://relabo.mdmaternityaccess.org/uploads/1/3/2/6/132681026/pazariziratib.pdf
    • http://files.dancestudiojump.com/uploads/1/3/1/6/131606798/pekulamalew-kisonifu-rudolojekumiviz.pdf
    • http://files.pd-parenting.com/uploads/1/3/0/9/130969999/bexulogewilelasetiza.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0381/files/64995872622.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/sissy_slut_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/fupone.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/15403034304.pdf
    • https://cdn.shopify.com/s/files/1/0428/9429/5203/files/44835040229.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/inmate_search_durham_nc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89089693040.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/japexevipafowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/bunediruxufegaberidez.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/15920397883.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/business_communication_process_and_product.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/gesokukajipas.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_off00006767.bin
848184cfc22870afa3d2852ad3dd3fb61e1828a29767033144d4310c3c5b5c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6767 5412 bytes
font_01_sfnt_off000079bc.bin
3aa1cd776f683d10bfebae7cd19a0033a72782573b6140c43934b3a8b8fbf852
pdf-font-stream PDF embedded font (sfnt) at offset 0x79BC 9528 bytes