Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe49dac0e113e2b…

MALICIOUS

PDF

48.6 KB Created: 2020-08-20 01:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b9c5861508f1a57c9b52f4f4b01ae6 SHA-1: 8f51ef1e24a85ed3ab1d0692dcf73922b459a469 SHA-256: cfe49dac0e113e2bb993007364a9967c4738b292143969d17e8f710ed29ca034
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=couper+des+pages+pdf' which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=couper+des+pages+pdf
    • http://zabitijit.caffeinatedhustle.com/uploads/1/3/0/9/130969723/4545140.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/luis_cernuda_las_nubes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/ritituralejukijevusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/93586743830.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/lizisefitelonuvulifogaxum.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/62964718369.pdf
    • https://cdn.shopify.com/s/files/1/0436/2685/6601/files/aihole_inscription.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/xadukiwuwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/46454932443.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/how_to_update_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/giputumepuvodagom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/psychology_12th_edition_carole_wade.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7932/files/tipisokejajodixaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/viloronijiletamuzolodoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/971669936.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_off00007ca8.bin
723712797eccd313d62642b47d23cb6a0cc462c99eeb4cb47f01647b7497727b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA8 5084 bytes
font_01_sfnt_off00008e03.bin
42ae8373077a81b0cbf053a02f009fa1ba7ac3d816147eeaa65f75fcf6d6ae40
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E03 12036 bytes