Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9ec61aa060be8d…

MALICIOUS

PDF

39.3 KB Created: 2020-09-07 07:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02eb4497bd816ae942a833596de929ed SHA-1: 33e0d0b835c895f46cbdae5b0063d33be178dcfe SHA-256: fb9ec61aa060be8def2354185f2452c11fc283f7b61822c22b988ba6cbdcb880
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as information about updating an Android device. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' directly indicates the presence of a link to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL that is likely intended to trick the user into clicking it. No scripts were extracted, limiting further analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=como+atualizar+android+samsung+core+duos
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/4090355038.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/1814378485.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8163/files/applebee_s_menu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1501/8392/files/l298_datasheet.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_ffffb94b5af8457ea4815116f38eac26.pdf
    • https://static.usrfiles.com/ugd/4dbf3f_4e68b83f958e4404aab9e6949ef439f6.pdf
    • https://static.usrfiles.com/ugd/a43ec6_392e07b9d504499ab633bf230e0f3a72.pdf
    • https://static.usrfiles.com/ugd/963627_930a2c201fb645718f6d34fcb94c1417.pdf
    • https://static.usrfiles.com/ugd/9ea91e_6ca2c69386ef4f468112b3ab5359cfca.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f0ef534d9c14e938ebf0f527d2bec38.pdf
    • https://static.usrfiles.com/ugd/79e0dc_8f45e32c385d4ac38252c4cd57b86e81.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2800795a942465ba1123ff4c7048585.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_off00005ab1.bin
b7470497f14517cf95b633305be798d03c6e083f6f9c877855ff172a04a0b609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB1 5216 bytes
font_01_sfnt_off00006c58.bin
926dcb2e5e6398a486f32d14ed0b3ff744ec5628d74353159e5116cd8e9a9738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 10524 bytes

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