Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bb38d9be90e0ad…

MALICIOUS

PDF

44.2 KB Created: 2020-09-03 03:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af38a3a9afb5ccd898d5a4b479eb19fc SHA-1: 25bd3e4df6a8a91c0c2cce67e3b52631e0f2dacd SHA-256: f5bb38d9be90e0ad9b76100b3ed64d41ad4e02395527b6186fa4543216355452
150 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and a keyword suggesting a lure related to 'atmospheric contamination'. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, many pointing to static.usrfiles.com, likely an attempt to disguise malicious intent within a larger link farm. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=contaminacion+atmosferica+pdf+2017
    • https://static.usrfiles.com/ugd/d9d1f5_d354b14539774ff9befdeffbf0f1c30d.pdf
    • https://static.usrfiles.com/ugd/fac845_1638333af8bf440fb924107b47e4c0db.pdf
    • https://static.usrfiles.com/ugd/a421e3_e2d05d9cf6424d8f8f2a8d713fb592bf.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_d1390237dae8449191755a8d920c17ac.pdf
    • https://static.usrfiles.com/ugd/ac8c68_bd335ad2d7d84a12acc86fae53c00660.pdf
    • https://static.usrfiles.com/ugd/07ef24_18fcd89741854df19317175a27f3614e.pdf
    • https://static.usrfiles.com/ugd/60ffa2_80117d4f6e6240d4a6fc2bcc65af291f.pdf
    • https://static.usrfiles.com/ugd/120f26_459234f285e0420987e1ceefa820f9cc.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0259/files/demuraxadusivonuxutagok.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/tuveravem.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/42781626735.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/conjunctive_adverb_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/13109165562.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/craftsman_model_113_table_saw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1033/4620/files/wobomexufuva.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_off00006b77.bin
8947533f24e49a586fa0f9099b2f4fd226458b18ab542eac8be389295779e7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B77 5580 bytes
font_01_sfnt_off00007e62.bin
5749440194a1eee307ad9f23b5f0486800eede0a003a0a4b6f50f4aa30cb7c74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E62 10972 bytes

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