Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ed289a6e563fd7…

MALICIOUS

PDF

33.7 KB Created: 2020-09-07 20:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ad58e5ad6be219285ef6a9b5025f717d SHA-1: bbc38bdded551f930820bb19f8cf13dda6bd5e71 SHA-256: f4ed289a6e563fd708360e3e7e830d97674da2b51bea684f74f52c33376014e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised as a refrigerator manual. This suggests a phishing or scam attempt, likely using spearphishing as an initial access vector. The presence of a large number of external links, many pointing to benign content, indicates a link farm SEO tactic, potentially to obscure the malicious redirector.

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.link/wix?keyword=whirlpool+refrigerator+manual+wrs321sdhz+01 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/70c1f8_6f743287dbb1457a8ed86e72cb3c0861.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cb5dea_7a4a7c16acf74ee7a872e4a894ccbe5c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/48d9a1_04150b3c965a4f4d846cb208767c67d7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/50c35f_1902d22019d94b23bef6fa80c5b52e25.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/99a8f2_6dd76db202124a6c950cfaacd7019c56.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/07625c_14f76768abb94726a7e44dd999ef94fe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/865d50_1ebd81db749a415aa252cdc9c8ab893e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/575363_7af88c86cc064c2d9073c61e1d938d09.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e33828_090f31d3fdfd4195933295b2e13d1683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3601/1678/files/jafifubogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5042/6519/files/13056523673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3908/7002/files/dorilemivuwevizoxeja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2190/1729/files/bible_stories_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/4687197108.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000457f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x457F 6100 bytes
SHA-256: 2c64167b613876972192705c02ee2406aea9a2ae5755d2c185c0065713253b64
font_01_sfnt_off00005a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A40 9344 bytes
SHA-256: c83862920dbe91c36998cc8bb17edda402c3a20d670e2afa948669b310e5cd9b

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