Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f47fa631a44ad0…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 09:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c22686f35156d6eb1b8fa70c8f9b4783 SHA-1: d56a446dfac0d5c2b35f8128e93aaae1617b2535 SHA-256: b0f47fa631a44ad0042aeb473d844c2058769bf13be12a4ca9babee59728967b
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for 'The signal and the noise'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a spam or phishing campaign. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=the+signal+and+the+noise+download
    • https://static.usrfiles.com/ugd/d902bb_f0fa27e8494c4d5d8fc9fd287bbf1efe.pdf
    • https://static.usrfiles.com/ugd/d99ef3_edc1392c1380473d8e2b089d3956caab.pdf
    • https://static.usrfiles.com/ugd/7c30af_77a7cd2b0c03409b83f59b2c1605b6e8.pdf
    • https://static.usrfiles.com/ugd/0aab01_fae91d3d872340c3ad3581a6582156c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b556fd772c44d8b82230052d94cc704.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5604d5f2d7741efba6f247756932ddc.pdf
    • https://static.usrfiles.com/ugd/accd1f_fe07f4a0d27046b6ad2a7fea5a2515a9.pdf
    • https://static.usrfiles.com/ugd/efb3f0_f73ee10cdbfd4c48973b5024a569bd26.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_915ce1d847d0425090f7220914f04580.pdf
    • https://static.usrfiles.com/ugd/cafc24_61542f40c69146d3abcc5186fd78be5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9082/files/goretezodaxirojepuwifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/57889624671.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0108/files/zesifil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/combiner_deux_en_un.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_off000062b8.bin
882565a4a0f4304c05a4775ce1e630a3576293944f35b63669409fee2c93b2e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 5032 bytes
font_01_sfnt_off000073df.bin
4aab03a8f84d9ef9814b88fd07382c8847249e53dc4ccc9eb87887684e70df30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DF 10200 bytes

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