Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a967fb32f7978f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 17:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18217ba8a2bceb5a18ea480e12ae64d5 SHA-1: 8fd3cd7fa20a241ba7f66e780c79cb6821a630d7 SHA-256: 71a967fb32f7978fde8eff12f0fb3e8fcd2a0fe431163fe5fd8013cbc5e5506c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed for SEO manipulation. One prominent link redirects to `https://ttraff.com/wix?keyword=perrine%2527s+literature+9th+edition+pdf`, which is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to literature and PDF, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of malicious redirector links and the SEO link farm heuristic strongly indicate an attempt to lead users to harmful content.

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.com/wix?keyword=perrine%2527s+literature+9th+edition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/banking_and_financial_services_act_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/minecraft_mods_download_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/vibimakefilepef.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/65697744308.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a77fbba861a436f9ccbe225fd91bce4.pdf
    • https://static.usrfiles.com/ugd/6290de_73dbddba19ca45e5a534708d2cf35dda.pdf
    • https://static.usrfiles.com/ugd/d5415a_55f301e708064a99b30348ffbc3eecd8.pdf
    • https://static.usrfiles.com/ugd/902d29_7ff2475fde1a4d6481ceb11fe0f8d0e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b2ea211f6774780906f6e8b7e9151f7.pdf
    • https://static.usrfiles.com/ugd/575363_b0707a48b22f4edca3e8149095cd4075.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d3958e0544203acd54e37eeedbea4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4d831feda404e4c92f81e710a87819e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bf50ae1afd24b6fb38718fd7279e402.pdf
    • https://static.usrfiles.com/ugd/c0fca2_d9170f1006d6471aa7bcc45fe45e0999.pdf
    • https://static.usrfiles.com/ugd/8ba634_eadaa6790a1d443c916f64f0e894785c.pdf
    • https://static.usrfiles.com/ugd/599026_32de19f8cab042a2b01b107ec9b4de32.pdf
    • https://static.usrfiles.com/ugd/b8c837_293f874f1fd447a6b61eb93b23555e6e.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_off0000681d.bin
16a518b175023736101dd617ffad63e5f4c9f61c2188cdabe91f945ac2fd142c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681D 5320 bytes
font_01_sfnt_off00007a23.bin
90a22a55d1968b2c5a33e556f91f8a868060b5473b246e75434e5c6a48d1deef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 10900 bytes

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