Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8c883942bac721…

MALICIOUS

PDF

43.8 KB Created: 2020-08-29 07:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389014c805ba091fa3462dff5ff2d4e9 SHA-1: 2e71ac740561e10380f3bd4e05a68763d1500356 SHA-256: ce8c883942bac721cccf456bed69b802fe603e4ff0d4d53f552425c8a4f6ea83
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This indicates the document is designed to redirect users to a potentially harmful destination. Additionally, it features a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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/wix?keyword=%25C3%25BCcretsiz+mp3+oldies+m%25C3%25BCzik+indirme
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/questes_administrao_geral_e_pblica.pdf
    • https://cdn.shopify.com/s/files/1/0441/1988/3928/files/bangla_quran_translation_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/lenerosewifiboset.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/lonadimolodunumevovidumem.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/harrison_cardiology.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/78967919467.pdf
    • https://cdn.shopify.com/s/files/1/0440/7666/2949/files/75126424900.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/zikiragagufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7694/4033/files/depajevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/zezeduleroboke.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eb25f9902e447c89147184e0b68948f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f337185dd1ec44b28983f4b22a269e09.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b546b7558644c3e81c4cf2baa630048.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_off000067ad.bin
8adc0d323c9ec840d24ad440100612d22f9b63987b35add9979a4a199404612c
pdf-font-stream PDF embedded font (sfnt) at offset 0x67AD 5420 bytes
font_01_sfnt_off000079d5.bin
abe686f66fbc0d87b395ebf20b707d2311efad4dad9d1906543fe3a12f990793
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D5 12196 bytes