Malicious PDF — malware analysis report

Static analysis result for SHA-256 47358078188b3ae8…

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 14:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a85629ac9982974c691c34ea8158cefe SHA-1: 7ba7f10a833c3cafe33b0ffd205700ea94e32584 SHA-256: 47358078188b3ae8e51b99994fc616e63b33f9948c6a3b90e4c1421dca42e0a7
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning or link farming. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=definicion+de+bacterias+gram+positivas+pdf'. The document body, though heavily obfuscated, contains this URL and references to 'wkhtmltopdf', indicating it was likely generated programmatically to appear as a benign document about 'Definicion de bacterias gram positivas pdf' while serving malicious links.

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/pify?keyword=definicion+de+bacterias+gram+positivas+pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/jivadewajuzamew.pdf
    • https://cdn.shopify.com/s/files/1/0437/2650/4086/files/30546909346.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/36728209194.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7692/files/23659055527.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/osrs_pk_builds.pdf
    • https://static.usrfiles.com/ugd/de3d83_14a7b95d47784ce48bfd525508b8b676.pdf
    • https://static.usrfiles.com/ugd/0aab01_b9e5c2c403114c5a8a084668947c4498.pdf
    • https://static.usrfiles.com/ugd/c345b0_177e0e7f654a492d8fa9abe07ffc17f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc95d66fb11e42509a72a70f3bc28c94.pdf
    • https://static.usrfiles.com/ugd/77d535_f1d497a1778f4223af4dda1abc64041c.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_off0000686a.bin
8e0194ad7c162dafea7d65f6a36155db7fe777dbe980b27ac9e2e14bfadb5652		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686A 5640 bytes
font_01_sfnt_off00007b94.bin
5ecad33c8ae037bec890ac1b68101b408694356fd30645924097397f8ad998a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B94 16764 bytes

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