Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ee7d1b92daf803…

MALICIOUS

PDF

38.9 KB Created: 2020-08-12 05:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207c0efe410b07a4a80f5ef625ae92f3 SHA-1: 657eb541e28273cd0dd4e58253d75d69c1ec1aed SHA-256: 80ee7d1b92daf803f83f9bb7e84acbf05f0a8f7a729749bf7d9f74dbed611637
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'pdf split tool online' and includes the malicious redirector URL. This indicates a likely phishing or malware distribution attempt, leveraging a lure to drive users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=pdf%20split%20tool%20online
    • http://files.lachouettealunettes.com/uploads/1/3/1/3/131382841/d80b7.pdf
    • http://files.myactiverestoration.com/uploads/1/3/0/7/130738723/majalonasiligi.pdf
    • http://rejesew.lily0-0.com/uploads/1/3/2/8/132814930/ad61d.pdf
    • http://noxisig.wsbcyork.com/uploads/1/3/0/7/130776483/bejak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/newedesutojivemekarenotez.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/27722579962.pdf
    • https://cdn.shopify.com/s/files/1/0429/8906/0259/files/35999469649.pdf
    • https://cdn.shopify.com/s/files/1/0436/5264/5017/files/addison_disease.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/40932080583.pdf
    • https://cdn.shopify.com/s/files/1/0432/2420/3424/files/bandhan_bank_account_closure_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vujunuvitiwowus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4992/files/articles_of_confederation_full_document.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0357/files/79508919745.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/21302375475.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_off00005c6e.bin
a183acafd76ff9eda583085e967218503fa3938b315c32cd82fc46b3f7bbb372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6E 4728 bytes
font_01_sfnt_off00006ca0.bin
9316bb7d2a83455c5d398da47c4b9f1d429738e665d9c6077b474c1054497c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA0 10084 bytes

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