Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d6dc560d10d012…

MALICIOUS

PDF

42.8 KB Created: 2020-08-23 06:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf89c8e7b682a8fef8fb95f7dae236f0 SHA-1: dce1bee91968938f946345c641a6f80206d29155 SHA-256: 24d6dc560d10d012933f29a87bfb4628e86f132d47017d36679f2302b0a057a1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.ru'. This suggests the document is designed to lead users to malicious or spam content. The ML classifier strongly supports the malicious nature of this PDF.

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=biopsychology+notes+pdf
    • http://gavunen.lionsdiabetesawareness.org/uploads/1/3/1/4/131406436/59abd.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/tolatipinofek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/gre_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/tedaxujeneku.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/sozetezimarozezunivusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/gimugime.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/31452701501.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/javafx_change_background_color.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/27052694610.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/sadopit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7253/files/java_certification_sample_questions.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/pagidelaku.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac4.bin
a4f89a874de66dbdb72642db73146e766a8bc298a5f697a31ba3de13a0ebba81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC4 5260 bytes
font_01_sfnt_off00007cb0.bin
0e64dda5cba423246481a78099f314f960056ef00c49c6ad0f05ef1671f659fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB0 10044 bytes

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