Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3e9e009e9f6ed5…

MALICIOUS

PDF

65.4 KB Created: 2020-08-05 12:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93a6346021aa0bd9aaf8ed9fecbad5e SHA-1: bb9fffcac314b27e7488d15698e829611fab8842 SHA-256: 4d3e9e009e9f6ed587a1b92d98fc3144f64a7bdbd48d716b04cc15e4028d5c81
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise the malicious intent. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document. No scripts were extracted from this sample.

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=bohr+s+model+of+hydrogen+atom+pdf
    • http://files.foryourmilitarymarriage.com/uploads/1/3/0/8/130814411/vixolalawedu_gixanewupabov_vojol_nejavagegapel.pdf
    • http://files.franklinvetclinic.com/uploads/1/3/1/3/131380476/ragiri.pdf
    • http://files.storywings.net/uploads/1/3/1/6/131637273/717901.pdf
    • http://files.ugoddessyoga.com/uploads/1/3/0/7/130739500/7057ac453.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/53276248061.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/99139609512.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/sufomirikolimabitipu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/76838977042.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/vovedizugezixifawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/91507359251.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/ginerifurutovojibopotar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/wexupironegow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/character_traits_worksheet_4th_grade.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_off0000b93f.bin
ae4462f1b581e0fabd2cb54603ec0e7cc8b90139c6066235b309aeda3a88dfcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 5604 bytes
font_01_sfnt_off0000cc32.bin
676425f59a89a7090eb109d8a8f3cb43e046f96a1870f57c5eff1ea7da8f8bf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 14088 bytes