Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37c57e081e1b0bb…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 15:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbbb8b24d06193be004d315ef870ae01 SHA-1: 3664cdaf547677eca9adea94c4702d77b248cc71 SHA-256: e37c57e081e1b0bb82a86bd7a28080664e1fb160585c51df5d435ab566abcfeb
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic identifying a malicious redirector link. The document body, though heavily obfuscated, also contains the same redirector URL. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or SEO poisoning attacks. No scripts were extracted, limiting further analysis of execution chains.

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/wix?keyword=grados+de+insuficiencia+venosa
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/37417009999.pdf
    • https://cdn.shopify.com/s/files/1/0434/3218/1909/files/calendar_template_free_november_2019.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1229/files/insomnia_hollywood_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/dasenabo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/zibatefoti.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/72029937605.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/13905040221.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/assembler_dili.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/naninomapimimobuvulefadib.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e81fd44c89242d781c1bddc7448a2a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d41640d3c184fca8f35edf71921ecee.pdf
    • https://static.usrfiles.com/ugd/b8c837_aadb38ffb99442bab22c92120aec1acd.pdf
    • https://static.usrfiles.com/ugd/f4de5e_ef9764a471534787a48b54f986761789.pdf
    • https://static.usrfiles.com/ugd/b8c837_4467c5b00ebe4e0292dafdbfc202cd1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_41ac5ccd51e14f04a62e0b6039b684e1.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_off00007304.bin
f506ff5d38ff82adf9f6368737b83296774bba596c469d4d7765f808dd593ca7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7304 5072 bytes
font_01_sfnt_off00008462.bin
02266509be5f5e9831dc2d6c5c04e818239e4bc8d753064651da56684eb8d6fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8462 10580 bytes