Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79db2012b695959…

MALICIOUS

PDF

47.3 KB Created: 2020-08-29 19:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32fff7739c84bef27452d65118751eb0 SHA-1: 4f744680a5e04f7f0b3e666821505795af8139c7 SHA-256: a79db2012b6959595a15a7d3156777f8a405f76aa854c9626d23ad56fb6bf1e1
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also contains the same URL, suggesting it is the primary lure. While the specific malware family is not identifiable, the presence of a malicious redirector points towards a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=evolution+smic+horaire+net+depuis+2000
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/fokibovuvexewavomifoseb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/michelin_guide_hong_kong_bib_gourmand.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1125/files/25224821977.pdf
    • https://cdn.shopify.com/s/files/1/0461/8980/5731/files/indian_women_headshave_photo.pdf
    • https://static.usrfiles.com/ugd/b8c837_928557fc88504efd843ea792ab26c7a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_557042824bb64950b51f14f45456db10.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c106e07f52c403bb00a9ab8189df849.pdf
    • https://static.usrfiles.com/ugd/b8c837_335d63ff9e3f45f1988abc2a80abd0d8.pdf
    • https://static.usrfiles.com/ugd/906e9f_fc0e32354c9f44a087f4d4afb89139c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_af10a04a980c4568ba22dc6c15a8475b.pdf
    • https://static.usrfiles.com/ugd/b8c837_57218dcf9dc4439c993db971d6dc7c39.pdf
    • https://static.usrfiles.com/ugd/b8c837_312d2b7503a846dc952064edeeabe65f.pdf
    • https://static.usrfiles.com/ugd/8cbfce_b77ac924a62245529b1abd5708a821f5.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_off000062d5.bin
b80f9cb4a2fb684082b7935b0c6c2edb614bb7b2811ccf5e278cccea9df77d84
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D5 5484 bytes
font_01_sfnt_off0000754f.bin
604d02e219dd57601c398e85389bdc8e492c44229aefb14e3ecd672cfecd6f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x754F 14136 bytes
font_02_sfnt_off0000a0db.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DB 4324 bytes