Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba13578f865adb82…

MALICIOUS

PDF

52.7 KB Created: 2020-08-18 22:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf90dadc6622779144fd3593df2cc58 SHA-1: 853006015466b9bd422fe302dd1c1d5335bb5d9b SHA-256: ba13578f865adb82a2cc17f4d174fe3e76c5000c6644ea0b708ac4c287dd3e70
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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/pify?keyword=multiplication+strategies+4th+grade+worksheets
    • http://wefuliwa.portlandraindance.com/uploads/1/3/0/7/130739275/lisexisivev.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/zapiwimapudivogebumez.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/kekivajupubixetebimuten.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/84225550559.pdf
    • https://cdn.shopify.com/s/files/1/0447/0548/0858/files/unilag_admission_list_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/79989835494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9114/9475/files/ropekun.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/77267869262.pdf
    • https://cdn.shopify.com/s/files/1/0434/2841/3607/files/notes_on_medical_bacteriology.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1443/files/74565611391.pdf
    • https://cdn.shopify.com/s/files/1/0434/4627/2162/files/lunch_break_sign_out_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8651/files/zisoperozorene.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008066.bin
1eb01e496a734f9ec33a92cbdda777c7bc79f2a2ca8caa783e7004c7aec343e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8066 5464 bytes
font_01_sfnt_off00009307.bin
f8dca96302eb7656f3f156dd6cb5d69d9b1f011e8765bdbdd2b0fb60ec0ea49a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9307 10868 bytes
font_02_sfnt_off0000b761.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xB761 4324 bytes