Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7d675a1e136c72…

MALICIOUS

PDF

64.7 KB Created: 2020-08-31 06:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f635d5a5bf1ac55a870e0e5bf62f23bb SHA-1: 217c8485010f0ad3a2bd0e63ed70caa2f58db3d3 SHA-256: af7d675a1e136c72a93230d08797b9bd1deac94713c63a8eeb33c429508bf1d9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to a link farm hosted on cdn.shopify.com, and one directly to a known malicious redirector at ttraff.ru. This indicates a clear intent to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.ru/wix?keyword=petit+sketch+pour+maternelle
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/wimititudaludor.pdf
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/9286292883.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/jibozoramexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/xuvajolatakoduk.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/levipebexolugusivobem.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/jixegakawinomonesovoj.pdf
    • https://static.usrfiles.com/ugd/77d535_cd4bdb606e0e45dd933e81e068835a03.pdf
    • https://static.usrfiles.com/ugd/d902bb_2c63f11cbfca4a54bbee8e7aa870886a.pdf
    • https://cdn.shopify.com/s/files/1/0435/2642/2687/files/fupezebat.pdf
    • https://cdn.shopify.com/s/files/1/0440/1915/5109/files/analog_signal_and_digital_signal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3526/files/pixaxegosurupuzuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/24317713934.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ee5.bin
090f131c3bfa7f6bf4c12e77152ffc0d513d27c47d298570a06fc49142de2591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE5 3080 bytes
font_01_sfnt_off000089fa.bin
a7f1877a0c09914c0c4cb06c5273ef1052e2570cbb28f48b47f2a42426f24788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 5236 bytes
font_02_sfnt_off00009b97.bin
9a8e1eba42215564ec1e9bdfacef7d2a2cb1da782d026630f9a0e629a982e9f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B97 2336 bytes
font_03_sfnt_off0000a60b.bin
b2c4652ab37ead7c65aec9ee7a5d1282afa9dd0de818075b979093ca71e9486f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA60B 18108 bytes
font_04_sfnt_off0000dd02.bin
dc38dbd846d6b7c71efd90c537ba914eef226a1422ebbdb340012a637dc5bac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16724 bytes

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