Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d619effce2cc12…

MALICIOUS

PDF

31.7 KB Created: 2020-08-14 18:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e509329e8507b083b16c496e51e8d90 SHA-1: 3a690fa7b644dce759bb17230faae78a6e816d5e SHA-256: 11d619effce2cc121bf5880bf4685dcaed6e5b3d6a5c89f65d8370c74e53aac9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the primary malicious URL. This suggests the document's purpose is to redirect users to malicious infrastructure, likely for phishing or malware delivery.

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/pify?keyword=deep+fitted+sheets+king+size+next
    • http://files.gretashaven.com/uploads/1/3/2/7/132740670/sutuke-fimaxokape-baxuxupelowoj.pdf
    • http://repilomux.ezexs.com/uploads/1/3/0/7/130739072/pajutat_fuwoxusupum_firoj.pdf
    • http://files.tinaspicks.com/uploads/1/3/0/7/130738568/d6e09.pdf
    • http://files.stfrancismf.org/uploads/1/3/2/8/132815748/bokak.pdf
    • http://bebiroka.qksnd.com/uploads/1/3/1/1/131164250/3253706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/83137306708.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0776/1819/files/wifevudiwixumof.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/wupejinapufedar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0439/1727/9400/files/wuzafejaponegegifoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lagikemirulufuwetore.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_off00004367.bin
dc91a4effd5047f53316df727519c123eb1b31c22f49560b4e9ec18bc90c64e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4367 5144 bytes
font_01_sfnt_off000054fb.bin
9aae90f83d45e9cc3193556edd909a1edf9b11d309c1f08822b06b7a188ebb14
pdf-font-stream PDF embedded font (sfnt) at offset 0x54FB 8564 bytes