Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae2f37abf8cad20…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 01:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc48ebb2a8b98957e84a3e10661330e8 SHA-1: 879ab7ce1fdd47420a164750d3af5135f1976639 SHA-256: bae2f37abf8cad20bc2fcd45df326236d4a2bae70d5b7a8f1ef9041bf8293823
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=o+d%25C3%25B3lar+%25C3%25A9+quanto+agora+em+nigeria'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user.

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=o+d%25C3%25B3lar+%25C3%25A9+quanto+agora+em+nigeria
    • https://static.usrfiles.com/ugd/b8c837_7a4506a47f6047d0a94f367898079fad.pdf
    • https://static.usrfiles.com/ugd/9a242c_d021d2ec8bd4487ba319cbfe4a0a2aca.pdf
    • https://static.usrfiles.com/ugd/b8c837_4259170dd6614c77b0ad88628532af12.pdf
    • https://cdn.shopify.com/s/files/1/0432/3174/0066/files/votirifoloramogaz.pdf
    • https://static.usrfiles.com/ugd/b8c837_89d5308107374ac8927f28b604a1b444.pdf
    • https://static.usrfiles.com/ugd/b8c837_849a8febcf734a0292e4c09faf8f00b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_50fb5fd106654119a8fcc2913c9d35d5.pdf
    • https://static.usrfiles.com/ugd/79cb75_ad1d7ce9361c412baf7af46d1647fbc5.pdf
    • https://static.usrfiles.com/ugd/10a4aa_65368bf1be234ab7aaa4b48ab134b451.pdf
    • https://static.usrfiles.com/ugd/430cb2_48b2cd5acbcd4fb38ae691c34c2ccddc.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_off00006805.bin
05f69975febf84f5aecdbe4e254fa5fa449a8b1e15db0fb9ac7bbc44a14db6ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6805 5396 bytes
font_01_sfnt_off000079ba.bin
69eda7018987a20d3c2334113a317f2e2eb875081dbbe9751bf07dd40f923d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BA 13152 bytes

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