Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d66e992bf5a589e…

MALICIOUS

PDF

43.4 KB Created: 2020-08-10 04:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2edaab78ec0d4b6438ad72ebc072a2c SHA-1: b3d8952baf8f89d82a57f93408a68abf7b6fda2e SHA-256: 6d66e992bf5a589e9790d82d89d222fd9ca0129cc9d271c24e3816ddc96b3960
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector at 'ttraff.ru'. The document's content and structure suggest it is designed to act as a link farm, potentially leading users to malicious sites or further malware downloads. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of 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.ru/pify?keyword=argumenta%25C3%25A7%25C3%25A3o+e+ret%25C3%25B3rica+pdf
    • http://files.aphroditesislet.com/uploads/1/3/2/6/132681460/4542461.pdf
    • http://files.busybeingbossy.com/uploads/1/3/2/6/132682899/rinapovedixami.pdf
    • http://files.ebonnyvonne.com/uploads/1/3/1/4/131453541/2225634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kebiwubinixakagaxirefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/gisiladowefodejagejawiben.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/6997882364.pdf
    • https://cdn.shopify.com/s/files/1/0445/2660/0351/files/panchatantra_stories_in_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/10437927267.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/7_days_to_die_nitrate_powder.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/cain_and_abel_novel.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/asmaul_husna_khassida.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/41812146716.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/12814513389.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/48244019559.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f26.bin
cf30e34b2798b20727fb9e474f8b2a744753c0b0e963001e7501c5d86204fd3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F26 5888 bytes
font_01_sfnt_off00007206.bin
c3676e60f3f5833abadf4665d825e842c25da1789a16c98cbf44dbe64159fc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7206 1940 bytes
font_02_sfnt_off00007b37.bin
bf6455726ac33142eca3f8e8388a43a03789be1da0f786ea1770d4c3c633925b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B37 11752 bytes

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