Malicious PDF — malware analysis report

Static analysis result for SHA-256 905a6247d7563995…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 11:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e5e73795336890e712df9b1975c1bd SHA-1: 3a855100d286c8aa4b053188347df4bbd33324cc SHA-256: 905a6247d756399528cb065205f0b072723eb8291964127508efcc2c592296a1
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'statistics principles and methods' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting the malicious intent.

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.com/wix?keyword=statistics+principles+and+methods+7t
    • https://static.usrfiles.com/ugd/b8c837_2fd0a6254a624316afc839a0cfb07ffb.pdf
    • https://static.usrfiles.com/ugd/4cf28d_e0193ac57594457183e75448c5dbba19.pdf
    • https://static.usrfiles.com/ugd/b47706_90d42e842d5b46f8a4d44e3fd9549654.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/37951237736.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/69542506622.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/tanewonuvixiranuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/grand_opening_postcard_template.pdf
    • https://cdn.shopify.com/s/files/1/0463/9916/0475/files/netflix_app_android_minimum_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/rorapimetekog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/nonprofit_bookkeeping_and_accounting_for_dummies.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffd1bbf60eb34cfbb1c6da734c7142c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e847a8f80fd549a3a5b5a5386cd21c87.pdf
    • https://static.usrfiles.com/ugd/1d64af_72406058c89e4e53881ff7bcd4ebf95c.pdf
    • https://static.usrfiles.com/ugd/69695d_f642e33f8a3742ee80e806dd4a626f79.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_off000060b7.bin
ef7758ffb039290e2ec228a8458b0b76b74a8928edb097a7cae568cf53b60e80
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B7 5496 bytes
font_01_sfnt_off00007331.bin
292719ee83b38343716def876d7160add2bb95bc0c2ae515477e728f454ebfe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7331 10396 bytes