Malicious PDF — malware analysis report

Static analysis result for SHA-256 121ac75507b180f3…

MALICIOUS

PDF

44.4 KB Created: 2020-09-07 07:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86c2880ab0bdad205ec7cd4178abf862 SHA-1: 98e6abc0772e2aeda5bc8f140305b3457d1b4f75 SHA-256: 121ac75507b180f3dbe63f88e8581544e0e4b330bf45de80d75172001f6710a8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised with a medical keyword. This suggests a phishing or scam attempt to redirect users to a malicious site. The PDF also contains a large number of links to other PDFs, likely for SEO manipulation to improve the ranking of the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or scam campaign.

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.club/wix?keyword=fusiform+aneurysm+treatment+options
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/kawasok.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/wizatululalokeba.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0552/files/ignou_ba_public_administration_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/sowifemepefiguvib.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/57154051249.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/empires_and_puzzles_hero_ranking.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8969/files/the_arcana_mod_apk_1._49.pdf
    • https://static.usrfiles.com/ugd/9421c8_6d6ebe4d757a425fbb322f1c27a96e6b.pdf
    • https://static.usrfiles.com/ugd/314c35_5c58d29b44e04e27adb4e60a228ddde1.pdf
    • https://static.usrfiles.com/ugd/d48fe3_8e7624cebdfa4c6b83da7740a2bbebc9.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/fast_math_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/navasatifiwen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/xipowedimofofam.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_off00006ff5.bin
f80a0f6269d575429f1740a665438e33f883f9283ffb782a51bffafcaad79e01
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF5 5072 bytes
font_01_sfnt_off00008129.bin
b7b831afa6433cc706da837e630407d208a7e48c1e8c2ae1329f38365ed180d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8129 10420 bytes