Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c0d3b3fa8a4daa…

MALICIOUS

PDF

52.6 KB Created: 2020-09-05 03:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d62bc1e00d77e62f5dd9aeab8941a7d5 SHA-1: 24b59f06014d8d1df327768581a126b95a675282 SHA-256: 03c0d3b3fa8a4daa5d63255428e6abaa5fbca2c88bb6be127935172098baa0cc
154 Risk Score

Malware Insights

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

The PDF contains a deceptive title and body text suggesting it is for children's exercises, but it embeds a malicious redirector link. This link, along with a large number of other PDF links, points to infrastructure designed to lead users to potentially harmful content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious.

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=zawody+po+angielsku+%25C4%2587wiczenia+dla+dzieci+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/birenarinudobax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/critical_care_transport.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0968/5150/files/foundation_papers_in_landscape_ecology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/vinisabosiwawanetatabul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6916/9045/files/65712214873.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1fa6dd_ad0304296b874562a749d331c5c609f9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7d21c0_a8668a4d7c7841cbb6dbf9d389f15f78.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b1dabf_edb8954515084ef3bac8355f870dd295.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/7946447340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2857/6416/files/nawifulorobojatusot.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6508 5628 bytes
SHA-256: 948604346f459a4f9c1d95a28d8500f7ddf43513e18469fa535466b857c2f630
font_01_sfnt_off0000782a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782A 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000080b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B8 14852 bytes
SHA-256: 98fd6a6d6353620088ceda80b93449dd5cb5891b325e1d8f359900529835fbac
font_03_sfnt_off0000acda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDA 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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