Malicious PDF — malware analysis report

Static analysis result for SHA-256 90421acca991a446…

MALICIOUS

PDF

49.4 KB Created: 2020-08-31 12:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 852ab6d58d5b2792bfcba7fda7b63604 SHA-1: 06ed5f9a7c0d927db475505db83c80bf0db63c28 SHA-256: 90421acca991a44645656146bb4e54cd8b45a01fb8bfaedd6b541600d0c7f731
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=bts+flute+sheet+music+euphoria'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/70a38d_d3c54410dcbe48a3b230f64cbb288ae0.pdf' being the first identified. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise malicious intent. The primary malicious URL is likely used to redirect users to a phishing or malware distribution site.

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.ru/wix?keyword=bts+flute+sheet+music+euphoria
    • https://static.usrfiles.com/ugd/70a38d_d3c54410dcbe48a3b230f64cbb288ae0.pdf
    • https://static.usrfiles.com/ugd/fa6f14_cd3546f316d642d591bcf45fc6787722.pdf
    • https://static.usrfiles.com/ugd/b8c837_48dc53febf4446e7a5fe830090f0ea75.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/business_communication_notes_for_mba_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/5883236791.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/81236663427.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/solevupulidute.pdf
    • https://cdn.shopify.com/s/files/1/0435/9267/9582/files/anemias_carenciales.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/litepadapaxixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/63167221480.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005295.bin
82be9ad1d6a5049eb297986a6898169f0552aefda67906e5a8dda5d491231ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5295 3724 bytes
font_01_sfnt_off00005fce.bin
6c596ac1192c1c37c5524849588faa1649512094143543dab06005e39e138765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCE 5304 bytes
font_02_sfnt_off000071b0.bin
a6ffcb7f6ff43c45196fa4e467f2cbe1472252ffb30acfae19b7808ae51eac64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 14260 bytes
font_03_sfnt_off00009f71.bin
b38f3699114d51116a847f8c70993f6dd8f6fe38f813ac4d481d89627660cc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F71 16500 bytes

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