Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf665b87e360b74…

MALICIOUS

PDF

61.1 KB Created: 2020-07-31 12:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09347dd7c0720d1a1c1d5de62354ca6a SHA-1: 1688f69bce37749865ac151427769d3ab413bb7b SHA-256: ebf665b87e360b74386a616e06554aef8e68eada6d00450f8d7c1e477cabf77c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, ttraff.cc, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Candidiasis oral pdf scielo', suggesting a lure to academic or medical content to mask the malicious redirection.

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.cc/pify?keyword=candidiasis+oral+pdf+scielo
    • http://files.silvaopus.com/uploads/1/3/1/3/131398174/woduti_buzibupenev_xowojulevaxedij_xazikare.pdf
    • http://files.shadeforplants.com/uploads/1/3/2/7/132740405/2082ead6d523.pdf
    • http://files.alpinedesignsmt.com/uploads/1/3/2/3/132303163/5733821.pdf
    • http://files.beyondprocess.com/uploads/1/3/0/8/130874431/gefutoridoj_waxuwowux_moxurimege_modururumi.pdf
    • http://files.beyondprocess.com/uploads/1/3/0/8/130874431/gefutoridoj_waxuwo
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/50995811152.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/31144403126.pdf
    • https://cdn.shopify.com/s/files/1/0433/9702/1861/files/fabovol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8424/files/4930264867.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/53526366802.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/fagofixeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5521/files/jifiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/88907227587.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/bogakoguribugavud.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/90980354923.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/60048066938.pdf
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/59060341039.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/62871828302.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_off0000b226.bin
7703d690f3ad9c669465a2627408da7e4b62ad3758d23d7cc433bba6870aec3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 4880 bytes
font_01_sfnt_off0000c2c6.bin
710d6136c291f1f180f091d1bcf8b6f0af82e558c2be5b309a7e39046cf7dd23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 10708 bytes

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