Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b82bc9063a68c03…

MALICIOUS

PDF

42.8 KB Created: 2020-08-04 13:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 127567a73941d4b94d93a28607a4f683 SHA-1: 82d39cccd55e334fa7edc881d68938dd5fff8b7c SHA-256: 4b82bc9063a68c035acb382215312fc9b3411dc922f5039377ae8150d1a7932e
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious link, 'https://ttraff.cc/pify?keyword=subluxacion+atlantoaxoidea+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files hosted on Shopify, suggesting a potential SEO manipulation 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=subluxacion+atlantoaxoidea+pdf
    • http://files.stephenjonesjewellers.com/uploads/1/3/1/6/131606490/kurerokipudopobo.pdf
    • http://files.dispatcherdame.com/uploads/1/3/2/7/132740277/mikexiw-fudimixedazuse-sadosekog.pdf
    • http://seperom.handsofoizo.com/uploads/1/3/0/8/130814017/7515346.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/primary_1_english_grammar_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/7799/0568/files/95783846870.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/39004900946.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/96147476418.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/26015387555.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/lafoke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81397135942.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/lixavemodavijeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/ancient_greek_empire.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/70602331778.pdf
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/54489489338.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/57917823003.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_off00006890.bin
e4a3dc9752e90780c593be567f4eaa8e7c4323497c862ec86b84158f7a21f28f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6890 5188 bytes
font_01_sfnt_off00007a4e.bin
1a4304bc7d8ca4b1ae59915b3c5371372fd1a4c19fc996da167d0e3086b97d0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4E 10552 bytes