Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce14175bdeef910c…

MALICIOUS

PDF

68.6 KB Created: 2020-09-10 15:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ad51d8cc0fb7e96403121fe8f5585fd SHA-1: cca5e5f361a93c1778cdd933633b20ed111856f7 SHA-256: ce14175bdeef910c938281d1dcb37d453a908e20e878cabc8b76efbe54ab4755
150 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.me/pify?keyword=concrete+abstract+compound+and+collective+nouns+worksheet'. This URL is presented within the document body, disguised as a worksheet. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the combination of the malicious redirector and the document's presentation suggests a phishing or malware delivery attempt.

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.me/pify?keyword=concrete+abstract+compound+and+collective+nouns+worksheet
    • https://static.usrfiles.com/ugd/51c472_34f2f3bb7ef44bc5ae1b0aef0c81401b.pdf
    • https://static.usrfiles.com/ugd/b8c837_963d92698c7844c393e7377a5d1421e7.pdf
    • https://static.usrfiles.com/ugd/694d5d_18c39b3148a04db8998b2c8c29763e3e.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/livisolizedonowunaraxo.pdf
    • https://static.usrfiles.com/ugd/735189_917c3426caf4463ebe7ae176440ca9fd.pdf
    • https://static.usrfiles.com/ugd/db1da1_7b6eef321b6f4610829597a5b7660c27.pdf
    • https://static.usrfiles.com/ugd/229b11_bd5e86e6ff41409e90e0a30f709c3191.pdf
    • https://static.usrfiles.com/ugd/d4579c_6fa7021e987a49d8a523c04e48c09449.pdf
    • https://static.usrfiles.com/ugd/65b209_91598e425c48454ea45a536576778260.pdf
    • https://static.usrfiles.com/ugd/a01749_62234fc0958842cca99a1e131d52194a.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_off0000c566.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 2828 bytes
font_01_sfnt_off0000cf60.bin
68bc61d51c3aaf47e94ab2124f4dd85e5636d0816aef0f0bf45d3db01da4fe1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 5576 bytes
font_02_sfnt_off0000e233.bin
72d1bd11131c765bcf0e15631b6a4f0e0ec9878a339e0d89a2b494d92bf526b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 10120 bytes

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