Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde163382772929c…

MALICIOUS

PDF

73.1 KB Created: 2020-09-05 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 751b073ead04b63e1824819045a78718 SHA-1: f1277ed2d788ac3ca54590082f08c457cfe116d5 SHA-256: cde163382772929cf81392699b78f1322e03d68403b6950dd25275bb9849a7a8
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, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=nitrogen+cycle+video+free', suggesting a lure to a malicious site. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious 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.me/wix?keyword=nitrogen+cycle+video+free 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/b8c837_2dc9ff70fd914d5fa4a2ff22bcb19ab2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2f197_4e07a19c730643569d27facb8272e9b4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/544c7e_17d41fe1612a4af5a18b8994aaaad445.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dc8a8e_a1551cc695a54f8f801eec92c8ed4c9b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e8506d_7fb3171f92e840f2a8cfaf748b432970.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dc8a8e_ea00d49769154a34b25bd27f4851f95c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f1a8d8fb428a40da929200404155cdd1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c8d394_a026d94b72fb4461984965e7c03477e5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b926a8_ae62976f2f1b41a8baa813626af6c397.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ca32a8_7bb9fa9b39b24af18a99cd1c9ef97dca.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4b874d_7b0136b983a44ec08473e54648a0667f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cac9e4_aaf46dfb3dbf419482738718c14fa9ab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/19543720292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/19963465099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/bteb_result_2019_7th_semester.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/91241700051.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 4932 bytes
SHA-256: 53584fc61901431ad85788be3ef9e9b7ec6b5e6933a41619f175a13d0cce3fd9
font_01_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 10292 bytes
SHA-256: 58a3ce161629450465c8d7e00738d794c377aeec74eac36c568250cbd6c85cd7
font_02_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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