Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b12f6882a7fd08…

MALICIOUS

PDF

37.3 KB Created: 2020-08-23 23:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be53579fbfc362a76ff73f66088b770f SHA-1: 03baa6dda208ccb02488f1858d2e050456db4f62 SHA-256: 90b12f6882a7fd0803bc0a4fb897a8bf3a47649e33ebefbd2c8cae0cdfd59003
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector service. This suggests a link farm or redirection tactic to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body contained mostly binary data and URLs.

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=andesitic+magma+forms+from+oceanic+crust+and
    • http://defoza.barnsofsummerscounty.com/uploads/1/3/2/6/132681482/vepezabomeji.pdf
    • http://padin.carpetcleanoahu.com/uploads/1/3/1/4/131453870/4257515.pdf
    • http://files.shoppiazzahomedesign.com/uploads/1/3/1/4/131437330/e632e.pdf
    • http://files.schlickscience.com/uploads/1/3/0/7/130775537/xaruragusugasukan.pdf
    • http://files.bayjedesigns.com/uploads/1/3/1/3/131379833/zexirokimipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/37070029568.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/android_studio_jdk_13.pdf
    • https://cdn.shopify.com/s/files/1/0429/9223/8745/files/loop_a_video.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/73597724392.pdf
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/19654631847.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/boliku.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/51516952629.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/80378852242.pdf
    • https://cdn.shopify.com/s/files/1/0434/8710/1094/files/57266500564.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/38407935914.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_off0000559f.bin
55abf19ca73440cddd245539946b18e4db4e7f9d3632a212ad9229efa28a2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 5300 bytes
font_01_sfnt_off00006783.bin
fbcb5a64f1b8386a7eea0a908c6c40cad4f8301cc250320f282f61dfc9f1dd39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6783 9644 bytes

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