Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ab39c58ffb166f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 11:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 385b0c5ca820e4705b0204b6cfa3bd31 SHA-1: 39831e1d306e82f7fe39f9a697a853edc956b6a1 SHA-256: c2ab39c58ffb166f56879871ca71553e2ffbfe399cafd9ec9120241a393ad160
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=qu%2527est+ce+qu%2527un+td'. The document body, though heavily obfuscated, contains this URL and other links to PDF files, reinforcing the lure. The ML classifier 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=qu%2527est+ce+qu%2527un+td
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/kidoxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/xuzixuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/53000472793.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/essilorluxottica_socit_anonyme_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5810/files/83976084745.pdf
    • https://static.usrfiles.com/ugd/7ff653_d2a302183fbd4af3874794c758cebc14.pdf
    • https://static.usrfiles.com/ugd/b8c837_f17a7107139c4720a0155e6e97f25fed.pdf
    • https://static.usrfiles.com/ugd/a107db_08606452eee34e37881cae491db9f9e5.pdf
    • https://static.usrfiles.com/ugd/4cf28d_e5ed8a95c71f4d13bcf699201a239e49.pdf
    • https://static.usrfiles.com/ugd/6cf392_c837331e34054cff8aa83e8d3ec8ef3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7d436a990e44393aaac78d2bab903c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_62870e096bf846fda9efd0458beedafa.pdf
    • https://static.usrfiles.com/ugd/b8c837_20e39a787be1497a9b1ff2e3c267bea5.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/andreas_moritz_amazing_liver_cleanse.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/jibunose.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_off0000684d.bin
1164d9d68d82e8709d49a583671552339c7d742f4a86d982d7242aa54ddf08a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x684D 4816 bytes
font_01_sfnt_off000078c4.bin
dc4678c1c1a374449fe87611f5fa4fdbd67c93660a6e33ffa7c08378e48c7e20
pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 12704 bytes