Malicious PDF — malware analysis report

Static analysis result for SHA-256 b986912a2f57e5bb…

MALICIOUS

PDF

47.1 KB Created: 2020-08-17 02:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91d140eff244a1cd01ef1c0f5ec297e SHA-1: 9e814ad4d0c6a6c72c2a173e96c13989f1282848 SHA-256: b986912a2f57e5bbc7f661747dcf5c6afbc725e2abb25b69b0d6baae9bd61d51
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a lessee information sheet. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic shows it's part of a link farm. The embedded URL points to a redirector that likely leads to further malicious content or downloads.

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=lessee+information+sheet+bir+excel
    • http://ramoxigib.suemurrayphotographer.com/uploads/1/3/1/6/131606490/06046cf93ea4718.pdf
    • http://files.charmsandsparklebyria.com/uploads/1/3/0/7/130775402/nulis.pdf
    • http://files.larochebluegrass.org/uploads/1/3/0/7/130739590/kojuwuvolosamopuwamo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/strategic_human_resource_management_jeffrey_mello.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/gogidinebekofinoseratodip.pdf
    • https://cdn.shopify.com/s/files/1/0452/8789/9297/files/10463146061.pdf
    • https://cdn.shopify.com/s/files/1/0432/5539/8563/files/bolerizazij.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/80767790262.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/57189273717.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/bupowitebemijakitekudawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1966/5561/files/84587411539.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/61287699375.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/chinese_herbal_medicine_materia_medica_bensky.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/sony_walkman_cd_player_user_manual.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/
    • https://cdn.shopify.com/s/files/1/0430/1966/5561/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d7a.bin
af1734dc69521ff83f830331216ba4a86a6d917079567555124e43e3472ae506
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7A 5060 bytes
font_01_sfnt_off00007e7b.bin
9d9b2cbf88afe508ba4a4c54024087c74ab0d55f99d554b5f256e54dba919753
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7B 10212 bytes
font_02_sfnt_off0000a0f9.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F9 4324 bytes