Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac3b38ea8a01abb…

MALICIOUS

PDF

37.4 KB Created: 2020-08-29 16:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b40f3f0477c15308c60eef9c4696776 SHA-1: 1d3b22a91dabe03c227c0033b51882fb41df98c1 SHA-256: 3ac3b38ea8a01abbd0a8d475bcb8e170627ccd0a0422c7b91ba6579921d2ede1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links pointing to external PDF files hosted on Shopify. One of these links, 'https://ttraff.cc/wix?keyword=qu%25C3%25ADmica+la+ciencia+central', is flagged as a malicious redirector. This suggests a pattern of SEO manipulation or a distribution method for malicious content, potentially leading users to harmful sites or further payloads. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=qu%25C3%25ADmica+la+ciencia+central
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/xuxipufaxoraxuwatidoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/wotov.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4812/files/94632386761.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/86627211440.pdf
    • https://cdn.shopify.com/s/files/1/0432/4648/5672/files/process_of_biotransformation_of_xenobiotics.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/46125021580.pdf
    • https://cdn.shopify.com/s/files/1/0430/8107/2789/files/actos_administrativos_de_los_presidentes_de_bolivia.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/jevigofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/59819309256.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/verb_to_be_simple_past_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/5984475752.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/42838178173.pdf
    • https://static.usrfiles.com/ugd/b8c837_edba4b13b61643b6aba3f2974e9d9bfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcbced4a0dc24b97ac1b3bec8faca0d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6addfa1903ca4b7481afaf82ee466e43.pdf
    • https://static.usrfiles.com/ugd/b8c837_621b0997712c45ac8e5f9ffee7e6cac4.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_off00005218.bin
09749252b407e94e386714417c12ecc4749ba70c94551ec87a47e24886c85f55
pdf-font-stream PDF embedded font (sfnt) at offset 0x5218 4884 bytes
font_01_sfnt_off00006299.bin
84ba07fbb832f54216b5cb1260a30fd750d9bec12aca38bfcc81e1a8e05c84d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6299 11152 bytes