Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b7531b8be1f139…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 02:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbbcbf306fd1242a49daae2de2ec934f SHA-1: 172002e570f3fc656a56857e19b57d238f951dfe SHA-256: d6b7531b8be1f139a3aa59afea3382c77e10e7dd0fcf9981331dddfa43fa7bad
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a redirector service, and the document body contains numerous links to external PDFs, many hosted on static.usrfiles.com. This suggests a campaign to distribute malicious content or phishing lures through a network of linked documents.

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.com/wix?keyword=princess+trainer+pleasing+the+mother+again
    • https://static.usrfiles.com/ugd/e2b09b_0d31a68db93a419db2f80e0fd081234e.pdf
    • https://static.usrfiles.com/ugd/b8c837_941cb09722124005a9a745a8750c1b6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7567d631f994d1c92a30438b87d2f49.pdf
    • https://static.usrfiles.com/ugd/de60da_f0ea886ccf1b4643a3f20f769049bed3.pdf
    • https://static.usrfiles.com/ugd/b8c837_17019950445d40e2b4290c7219e8af36.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_049ddf12fb954e33be810bd61a50633f.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_8b22fef351c74a08bea314e93e1c7f50.pdf
    • https://static.usrfiles.com/ugd/c63dba_53250d25e2b246528a45b87137405706.pdf
    • https://static.usrfiles.com/ugd/451461_110d04366b384b1cb47911cbc512b174.pdf
    • https://static.usrfiles.com/ugd/d94ae5_911a0477f6f34cb6946ab3d11e032c18.pdf
    • https://cdn.shopify.com/s/files/1/0434/4161/9105/files/microeconomics_jeffrey_perloff_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/a_clockwork_orange_slang_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2239/3244/files/58570024513.pdf
    • https://cdn.shopify.com/s/files/1/0434/0301/8392/files/scientific_workplace_free_5._5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ec8.bin
d4b42c2111307b5b5cc60d1d702aa79b6ed5b0d1a00fb464b10404c4780da6b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC8 3464 bytes
font_01_sfnt_off00007b21.bin
20b9f0b008e7882dde2ca1c7f8940706243ab9035a5f8e06a7c0c039dc7d37e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B21 5348 bytes
font_02_sfnt_off00008d12.bin
560e9fd3b76381b5ee1b74370f856da6cf36e65959d056d804f87d1f7309d35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D12 10260 bytes

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