Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e276c828ebc127…

MALICIOUS

PDF

39.4 KB Created: 2020-08-04 08:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ae64a6d7a12b8091cfcc8945d6bd8e4 SHA-1: e54abcd723165a2fc5309a2ef175a18eb4d85408 SHA-256: 76e276c828ebc127c04c35269d07b645f92c9e17d4e6ace85eb8e9381975f26c
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to a malicious URL, likely for SEO spam or phishing purposes. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point to a malicious redirection attempt.

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.ru/pify?keyword=que+es+un+brief+publicitario+pdf
    • http://files.merob.studio/uploads/1/3/2/6/132682790/kaguz_musofev.pdf
    • http://files.brazosmetaldesigns.com/uploads/1/3/0/9/130969847/1434662.pdf
    • http://files.teachpark.org/uploads/1/3/0/8/130874254/8042028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/ferezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/mutasux.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/lizonogubun.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6766/files/16490415101.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/rumoxawujebiwim.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/19837654922.pdf
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/82884488082.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/98929603245.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/kivotovuzew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/76566610696.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_off00005d62.bin
9555bd6306db7b203b63b62d230ddfcb7a82d9056517a1f7ab3ac592141931d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D62 5348 bytes
font_01_sfnt_off00006f93.bin
a228488bb93765ef0712fb35f81b9411758897d1f8d2b9903783dc39f97f3a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F93 10396 bytes