Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e1c3ffc3827176…

MALICIOUS

PDF

43.8 KB Created: 2020-08-11 07:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d86d8d98f1a8fa8e5b2858fae8ac14bd SHA-1: 850ec4afad7dbbe6d0e851e1809c3b9a14e9172c SHA-256: c8e1c3ffc382717681b7c948517ec95ae4c24a6b69c253b02720208a0c155521
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link to 'ttraff.cc' is identified as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to 'biomedical waste management rules 1998 pdf' and the malicious redirector URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=biomedical+waste+management+rules+1998+pdf
    • http://files.heritagehs.org/uploads/1/3/1/4/131454355/javavilufelon.pdf
    • http://files.capetowndaytours.net/uploads/1/3/0/8/130874629/bugob-bowon-jozopo-vudux.pdf
    • http://files.affordabletherapytoronto.com/uploads/1/3/0/9/130969954/zixep_dunix_gusikivalubut_biraruzujegozo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/robiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/critical_theory_in_research.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/58018833968.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/zomepekiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/30754982519.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/fezibonewol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/gipufevevebazuneboga.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3627/files/gmat_verbal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6296/0023/files/18318396052.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/5055043351.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/74402806457.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_off000069f0.bin
5137bd4b8cbc0755734ec89a7aa747283c3dd7ed6655b6870020dcef5395c13a
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 6020 bytes
font_01_sfnt_off00007e66.bin
a193cd9065183e83bd008fe9517a848370b7d53850fbb86b2b40c0a28d47df5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E66 10472 bytes