Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af94c7f7d379583…

MALICIOUS

PDF

42.9 KB Created: 2020-08-22 00:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b8b8ea4e946f512205f2d1fc653f983 SHA-1: 0da75d16569940e69a829c6913cc78db3bb28bb8 SHA-256: 7af94c7f7d379583ec383d505e29ee6d5f247b8d1a6a7c4701ca9e61fc044655
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 28 external PDF links, with one primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or content distribution scheme.

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.cc/pify?keyword=3d+live+animated+wallpaper
    • http://files.thesparklingfox.com/uploads/1/3/2/6/132680813/1d843c235a0.pdf
    • http://files.inveruriebowlingclub.com/uploads/1/3/1/4/131453402/sakal.pdf
    • http://ruguvan.k2physiotherapy.ca/uploads/1/3/1/4/131437363/fedifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/83043595753.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/pitijerudijefozojonaze.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/48347632981.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/85486843086.pdf
    • https://cdn.shopify.com/s/files/1/0436/2679/1072/files/best_reader_for_reading_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/41222781145.pdf
    • https://cdn.shopify.com/s/files/1/0450/3240/7198/files/gunnebo_speedstile_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/kufiwaxigopipusubopove.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/inspired_beginners_spanish_podcast_10_este_mes.pdf
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/learning_easylanguage_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0437/2522/6152/files/cemal_sreya_sevda_sozleri.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_off00006a9f.bin
529ad4e9a9186390f0693c6dd144ee485ebc84d2a4c03ba316117d4e2148030f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9F 5148 bytes
font_01_sfnt_off00007c1c.bin
4fc2ea24a52e9d882c36d429d76e77906b204a5147f696e3daea165daee388b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1C 10232 bytes