Malicious PDF — malware analysis report

Static analysis result for SHA-256 0991dfc778de6164…

MALICIOUS

PDF

38.9 KB Created: 2020-08-28 23:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a97617c1e8dee7c4373dd5ec8bdf4eb9 SHA-1: 553eb3e72543eb4faf23fa1ca205cc62d4ab6563 SHA-256: 0991dfc778de6164ee601a94f10cd451ddc700fbd1f8ca3aaa3911870a898a48
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure related to video game saves. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or SEO poisoning attempt.

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=assassin%2527s+creed+odyssey+manual+save
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_85a02cd4e13f44c7a75ca7189ebe6650.pdf
    • https://static.usrfiles.com/ugd/b8c837_1398ee65aaa34f92b29ee2abb46b524d.pdf
    • https://static.usrfiles.com/ugd/b8c837_605c73bb4fdf4a62acfc805c535965d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee0a549f8692443f815821bb22e3288c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba2ad8aab49f4d098695ec919d7a9c1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_67e7acd4ca64447d8afb699521dc813a.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/bear_market_trading_strategies_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4136/files/87553144210.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/avast_premier_crackeado_2018.pdf
    • https://cdn.shopify.com/s/files/1/0438/0819/4722/files/botrytis_cinerea_pers.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4518/files/wiley_cpa_review_2016.pdf
    • https://cdn.shopify.com/s/files/1/0450/2913/0404/files/dejuvosuwefi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a52.bin
be7bdc4ee8e921cce5439c706f58d02fe46da4981e1adf32cc720ef434c09a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A52 5272 bytes
font_01_sfnt_off00006c25.bin
af2cd416bd4eaeade2b67b7deec9d0616c0c4e60d0d14205a898aae9ef89e153
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C25 10352 bytes